Common Name: BLACK-SPORED QUILLWORT. Scientific Name: Isoetes melanospora Engelmann. Other Commonly Used Names: black-spored Merlin's grass
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1 Common Name: BLACK-SPORED QUILLWORT Scientific Name: Isoetes melanospora Engelmann Other Commonly Used Names: black-spored Merlin's grass Previously Used Scientific Names: none Family: Isoetaceae (quillwort) Rarity Ranks: G1/S1 State Legal Status: Endangered Federal Legal Status: Endangered Federal Wetland Status: OBL Description: Perennial herb with a bulb-like base and forking roots. Leaves usually 1-3 inches (3-8 cm) tall, very narrow with a pointed tip and a wide base that overlaps with other leaf bases to form a round, bulb-like underground base; each leaf contains 4 hollow air chambers separated by partitions. Spores are produced in a cavity (sporangium) in the leaf base, the cavity completely covered by a translucent membrane (velum) and containing dozens of tiny black to light gray female megaspores, approximately mm wide, with slightly dimpled surface ornamentation (seen with 30x magnification). Male microspores, which are produced on separate leaves, are also present but are dust-sized and indistinguishable without much higher magnification.
2 Similar Species: Quillworts are distinguished from flowering, wetland plants by their spongy leaves with conspicuous cross-walls and by the presence of sporangia in the flared base of the leaves. Piedmont quillwort (Isoetes piedmontana) occurs in muddy seeps on granite outcrops. Its leaves are 2¾ - 6 inches (7-15 cm) long with brown to blackish bases; its megaspores are larger than black-spored quillwort s and have a conspicuously dimpled ornamentation; Piedmont quillwort s sporangium is only partially covered by the velum. Black-spored quillwort occurs with Piedmont quillwort (Isoetes piedmontana) on several outcrops and has been known to hybridize with it. Related Rare Species: Mat-forming quillwort (Isoetes tegetiformans) occurs in similar habitats but it is smaller, with unusual, alternating leaves distributed along a horizontal rootstalk, and has smaller megaspores (see full species account elsewhere on this website). Black-footed quillwort (I. melanopoda, Special Concern) has leaves 2¾ - 18 inches (7-45 cm) long, black leaf bases, and white female spores; it occurs in shallow pools on granite outcrops, in seepy areas on Altamaha Grit, and in wet, clay soils of Coosa Valley flatwoods. Populations of an undescribed I. piedmontana-like taxon occur in shallow pools on several rock outcrops in eastern Alabama and in Coffee County, Georgia; these plants are larger than black-spored quillwort and have larger megaspores with conspicuously dimpled megaspore ornamentation and partial velum coverage of the sporangia. Nine quillwort species are listed or considered of Special Concern in Georgia. Six of these are included on this website: Boom s quillwort (I. boomii), Georgia quillwort (I. georgiana), winter quillwort (I. hyemalis), rush-leaved quillwort (I. junciformis), black-spored quillwort (I. melanospora), and mat-forming quillwort (I. tegetiformans). Habitat: Shallow, temporarily flooded, flat-bottomed pools formed by natural erosion on granite outcrops. The pools are seasonally inundated by winter and early spring rains and by seepage from surrounding habitats; they are usually completely dry during the summer and fall. Life History: Quillworts are seedless, non-flowering plants that reproduce by spores. Quillworts have a short, fleshy, rootstock called a corm; leaves are produced on the upper surface of the corm, roots on the lower surface. The leaves disappear during dry periods; however, the corm is still alive and will begin to produce leaves when there is adequate water. Spores are produced in chambers at the base of the leaves in May and June and are released from the chamber when the leaf base deteriorates during summer s dry, hot weather. Spores usually remain near the parent plant but may be dispersed by flowing water or insects. Some leaves produce megaspores, which crack open to expose tiny egg-producing structures; other leaves produce microspores, which develop sperm-producing structures. Egg and sperm unite and form new plants. Survey Recommendations: Plants are visible throughout the winter and spring and following rainy periods in the summer. Range: Black-spored quillwort is endemic to the Piedmont of Georgia and South Carolina. The South Carolina population is atypical, however, and may involve hybridization with Isoetes piedmontana.
3 Threats: Quarrying of granite outcrops, trash dumping, off-road-vehicle use, horseback riding, cattle trampling, and development of woodlands surrounding granite outcrops. Within the pools, the exotic species weak buttercup (Ranunculus pusillus) and water-starwort (Callitriche heterophylla) are competing with black-spored quillwort and associated rare species; in areas surrounding the outcrops, Japanese honeysuckle (Lonicera japonica) and Chinese privet (Ligustrum sinense) are the biggest threats. Georgia Conservation Status: Approximately 13 populations, 4 on conservation land, are known. At least 5 have been destroyed by quarrying. Conservation and Management Recommendations: Protect granite outcrops from quarrying, trash dumping, and off-road-vehicle use. Direct foot traffic away from rare plant sites and rock pools. Create no-impact buffer zones and limit development around outcrops. Eradicate exotic pest plants. Selected References: Brunton, D.F. and D.M. Britton Isoetes melanopoda spp. silvatica (subsp. nov.), a new quillwort (Isoetaceae) from eastern North America. Castanea 71: Chafin, L.G Field guide to the rare plants of Georgia. State Botanical Garden of Georgia and University of Georgia Press, Athens. FNA Flora of North America. Vol. 2, Pteridophytes and Gymnosperms. Oxford University Press, New York. Haefner, K.D. and R.D. Bray Taxonomic reassessment of North American granite outcrop Isoetes species with emphasis on vegetative morphology and I. piedmontana (Pfeiffer) Reed sensu lato. Castanea 70: Musselman, L.J Georgia quillworts. Tipularia 16: NatureServe NatureServe Explorer. Arlington, Virginia. Patrick, T.S., J.R. Allison, and G.A. Krakow Protected plants of Georgia. Georgia Department of Natural Resources, Natural Heritage Program, Social Circle. Snyder, L.H., Jr. and J.G. Bruce Field guide to the ferns and other pteridophytes of Georgia. University of Georgia Press, Athens. USFWS Three granite outcrop plants: black-spored quillwort (Isoetes melanospora), mat-forming quillwort (Isoetes tegetiformans), and little amphianthus (Amphianthus pusillus) species accounts. U.S. Fish and Wildlife Service, Washington, D.C.
4 USFWS Recovery plan for three granite outcrop plant species: black-spored quillwort (Isoetes melanospora), mat-forming quillwort (Isoetes tegetiformans), and little amphianthus (Amphianthus pusillus). United States Fish and Wildlife Service, Jackson, Mississippi. Weakley, A.S Flora of the Carolinas, Virginia, Georgia, and surrounding areas. University of North Carolina Herbarium, Chapel Hill. Author of Species Account: Linda G. Chafin and Daniel F. Brunton Date Compiled or Updated: L. Chafin and D. Brunton, Dec. 2008: original account K. Owers, Feb. 2010: added pictures
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Common Name: GEORGIA QUILLWORT. Scientific Name: Isoetes georgiana Luebke. Other Commonly Used Names: none. Previously Used Scientific Names: none
Common Name: GEORGIA QUILLWORT Scientific Name: Isoetes georgiana Luebke Other Commonly Used Names: none Previously Used Scientific Names: none Family: Isoetaceae (quillwort) Rarity Ranks: G2G3/S2S3 State
Other Commonly Used Names: wintergreen quillwort, evergreen quillwort
Common Name: WINTER QUILLWORT Scientific Name: Isoetes hyemalis D.F. Brunton Other Commonly Used Names: wintergreen quillwort, evergreen quillwort Previously Used Scientific Names: none Family: Isoetaceae
Common Name: GLADE WINDFLOWER. Scientific Name: Anemone berlandieri Pritzel. Other Commonly Used Names: southern thimble-weed
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Common Name: SHOALS SPIDER-LILY. Scientific Name: Hymenocallis coronaria (J. LeConte) Kunth. Other Commonly Used Names: Cahaba lily, Catawba lily
Common Name: SHOALS SPIDER-LILY Scientific Name: Hymenocallis coronaria (J. LeConte) Kunth Other Commonly Used Names: Cahaba lily, Catawba lily Previously Used Scientific Names: Hymenocallis caroliniana
Common Name: GLADE MEADOW-PARSNIP. Scientific Name: Thaspium pinnatifidum (Buckley) Gray. Other Commonly Used Names: cutleaf meadow-parsnip
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Common Name: FLORIDA ADDER S-MOUTH ORCHID. Scientific Name: Malaxis spicata Swartz. Other Commonly Used Names: none
Common Name: FLORIDA ADDER S-MOUTH ORCHID Scientific Name: Malaxis spicata Swartz Other Commonly Used Names: none Previously Used Scientific Names: Malaxis floridana (Chapman) Kuntze, Microstylis floridana
Common Name: YELLOW LADY S-SLIPPER. Scientific Name: Cypripedium parviflorum Salisbury. Other Commonly Used Names: golden slipper
Common Name: YELLOW LADY S-SLIPPER Scientific Name: Cypripedium parviflorum Salisbury Other Commonly Used Names: golden slipper Previously Used Scientific Names: Cypripedium calceolus Linnaeus Family:
Family: Parnassiaceae (grass-of-parnassus) or Saxifragaceae (rockbreaker)
Common Name: LARGE-LEAF GRASS-OF-PARNASSUS Scientific Name: Parnassia grandifolia A.P. de Candolle Other Commonly Used Names: bigleaf grass-of-parnassus, limeseep parnassia, undine Previously Used Scientific
Common Name: OZARK BUNCHFLOWER. Scientific Name: Veratrum woodii J.W. Robbins ex Wood. Other Commonly Used Names: Wood s false hellebore
Common Name: OZARK BUNCHFLOWER Scientific Name: Veratrum woodii J.W. Robbins ex Wood Other Commonly Used Names: Wood s false hellebore Previously Used Scientific Names: Melanthium woodii (J.W. Robbins
Common Name: HOODED PITCHERPLANT. Scientific Name: Sarracenia minor Walter. Other Commonly Used Names: none. Previously Used Scientific Names: none
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Common Name: GOLDENSEAL
Common Name: GOLDENSEAL Scientific Name: Hydrastis canadensis Linnaeus Other Commonly Used Names: none Previously Used Scientific Names: none Family: Ranunculaceae (buttercup) or Hydrastidaceae (goldenseal)
Previously Used Scientific Names: Viburnum dentatum L. var. bracteatum
Common Name: LIMEROCK ARROW-WOOD Scientific Name: Viburnum bracteatum Rehder Other Commonly Used Names: none Previously Used Scientific Names: Viburnum dentatum L. var. bracteatum Family: Caprifoliaceae
Other Commonly Used Names: Simpson s zephyr-lily, Florida atamasco-lily, rain zephyr-lily, rain lily
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Common Name: PARROT PITCHERPLANT. Scientific Name: Sarracenia psittacina Michaux. Other Commonly Used Names: none
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Common Name: FRINGED GENTIAN. Scientific Name: Gentianopsis crinita (Froelich) Ma. Other Commonly Used Names: none
b Common Name: FRINGED GENTIAN Scientific Name: Gentianopsis crinita (Froelich) Ma Other Commonly Used Names: none Previously Used Scientific Names: Gentiana crinita Froelich Family: Gentianaceae (gentian)
Previously Used Scientific Names: Schwalbea australis Pennell, Schwalbea americana L. var. australis (Pennell) Reveal & Broome
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Common Name: FLORIDA LADIES-TRESSES. Scientific Name: Spiranthes floridana (Wherry) Cory. Other Commonly Used Names: none
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Common Name: BOG SPICEBUSH. Scientific Name: Lindera subcoriacea B.E. Wofford. Other Common Names: none. Previously Used Scientific Names: none
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Common Name: THREE BIRDS ORCHID
Common Name: THREE BIRDS ORCHID Scientific Name: Triphora trianthophora (Swartz) Rydberg Other Commonly Used Names: nodding pogonia, nodding ettercap Previously Used Scientific Names: Arethusa trianthophoros
Previously Used Scientific Names: Habenaria quinqueseta var. quinqueseta, Orchis habenaria Linnaeus, O. quinqueseta Michaux
Common Name: MICHAUX S ORCHID Scientific Name: Habenaria quinqueseta (Michaux) A. Eaton Other Commonly Used Names: Michaux s orchis, long-horned habenaria, long-horned false rein-orchid Previously Used
Previously Used Scientific Names: Calopogon barbatus (Walter) Ames var. multiflorus (Lindley) Correll
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