Hymenostylium recurvirostrum var. insigne and Barbula arnplexifolia in British Columbia, Canada

Transcription

1 Hymenostylium recurvirostrum var. insigne and Barbula arnplexifolia in British Columbia, Canada RICHARD H. ZANDER AND P. M. ECKEL Buffalo Museurn of Science, Buffalo, NY, U.S.A Received August 26, 1981 ZANDER, R. H., and P. M. ECKEL Hymenoslylium recurvirostrum var. insigne and Barbula arnplexifolia in British Columbia, Canada. Can. J. Bot. 60: Hymenostylium recurvirostrum var. insigne (Dix.) Bartr. is reported new to the New World from British Columbia. Hymenoslylium recurvirostrum var. cylindricum (Bartr.) Zander is a new combination. A key to the varieties of H. recurvirostrum is given. Barbula amplexifolia (Mitt.) Jaeg. is reported new to British Columbia. ZANDER, R. H., et P. M. ECKEL Hymenoslylium recurvirostrurn var. insigne and Barbula arnplexifolia in British Columbia, Canada. Can. J. Bot. 60: Hymenostylium recurvirostrurn var. insigne (Dix.) Bartr. est signal6 pour la prernikre fois en ArnCrique; il a kt6 r6coltc en Colombie-Britannique. La nouvelle cornbinaison suivante est effectuke: Hytnetioslylirlm recurvirostruni var. cylitidricum (Bartr.) Zander. Une clef des varictcs d'h. recurvirostrum est prcsent6e. Barbula amplexifolia (Mitt.) Jaeg. est singal6 pour la premikre fois en Colombie-Britannique. [Traduit par le journal] Bridal Veil Falls Provincial Park, about 90 km east of 6656 (H! holotype). Gymnostomum subrigidulum Vancouver, B.C., is in the region of hyperoceanic (Broth.) Chen, Hedwigia, 80: climate characteristic of the coast of northwestern North America. The falls itself provides a highly humid Hymenostylium annotinum Mitt. ex Dix., J. Bot. 48: atmosphere over both calcareous and acid substrates in , syn. nov. its spray zone. Two rare and highly disjunctive moss TYPE: Bhutan, India, Gri'th 17 (BM! holotype). taxa were recently collected in or near the spray zone of Hymenostylium recurvirostrum var. insigne is known the falls. from hyperoceanic areas of Scotland and Ireland (Smith Professor W. B. Schofield of UBC made the first 1978), and under synonyms from Japan and Yunnan, North American collection of Hymenostylium recurvir- China (Chen 1941; Saito 1975) and Bhutan, India ostrum var. insigne (Dix.) Bartr. at Bridal Veil Falls and (Gangulee 1972). The variety insigne is not a wellsent a duplicate specimen to the first author for a second defined taxon, as many of its more important character opinion on its identification. He (personal communica- states appear in various combinations in other varieties tion) and the first author agree that this taxon warrants of the species (Table 1). However, the diagnostic only varietal status. A visit to Bridal Veil Falls by the character-states correlate with a distinctive geographic authors allowed collection of abundant material. distribution similar to that of certain other robust, highly Hymenostylium recurvirostrum var. insigne (Dix.) disjunctive taxa of hyperoceanic Pottiaceae, e.g., Bry- Bartr., Philipp. J. Sci. 68: 106, oerythrophyllum jamesonii (Tayl.) Crum (Zander 1978a), Didymodon giganteus (Funck) Jur. (Zander Weissia recurvirostris var. insignis Dix., J. Bot. 40: 1978b), and Molendoa hornschuchiana (Hook.) Lindb , basionym. (Zander 1979a). TYPE: Scotland, Binstead and Dixon, 1898 (BM! No infraspecific taxa in New World H. recurvirossyntype). Hymenostylium curvirostre var. insigne trum were recognized by,zander (1977) because of lack (Dix.) Roth, Eur. Laubm. 1: Weissia of clear discontinuities. However, to provide a framecurvirostris var. insignis (Dix.) Schmidt, Ann. Bryol. work for discussion of tendencies towards particular 3: Hymenostylium insigne (Dix.) Podp., morphologies within the species s.1. that are correlated Consp. Musc. Eur Gymnostomum insigne with characteristic geographic ranges, a key to inter- (Dix.) A.J.E. Sm., J. Bryol. 9: grading varieties is provided below. It is important to Barbula subrigidulum Broth., Symb. Sin. 4: , note that these varietal taxa are aggregations of populasyn. nov. tions near end points in extreme combinations of TYPE: Yunnan, Likiang, China, Handel-Mazzetti character-states, and many specimens can be identified /82/ $01.OO/O National Research Council of Canada/Conseil national de recherches du Canada

2 ZANDER AND ECKEL 1597 TABLE 1. Some examples of combinations of character-states in varieties of Hyrnerlostyliunr reciirvirostritrn (Hedw.) Dix. 1. British Columbia, Canada: Zander and Eckel4391 (UBC). 2. Scotland: Binstead and Dixon, 1898 (BM type of var. insigne). 3. Yunnan, China: Handel-Mazzetti 6656 (H type of Barbula slibrigidulurn). 4. Bhutan, India: Griffith 17 (BM type of Hyrnenostyliurn annotinurn). 5. British Columbia, Canada: ZanderandEckel4389 (UBC). 6. British Columbia, Canada: Tan and Teng (UBC). 7. New York, U.S.A.: Zander 4722 (BUF). 8. Vermont, U.S.A.: Grout, 1912 (DUKE). 9. Guatemala: Steyerrnark (FH). 10. Jamaica: Orclitt 5461 (FH type of var. cylindricurn). 11. Hawaiian Islands, U.S.A.: Hillebrand s.n. (H type of Molendoa crassinervis). 12. Nepal: B.D.Y., ex herb. Russell (BUF) var. insigne var. recurvirostrurn var. cylindricurn - - Stem papillose Stem epidermis present Leaflength,maximum(mm) Leaves strongly reflexed just below midleaf ? - 2?? Leaf base oblong, distinct * Leaf margins plane ? Leaf margins bistratose in patches Upper medial laminal cells rectangular, > 2: 1 Upper laminal cell walls thickened and porose Lamina1 papillae mostly simple (s), or bifid (b), or absent (a) s-b a S S S S b s s a Costa excurrent - 2 Costal adaxial epidermis present Width of lamina from costa to margin at midleaf (no. of cells) No. of costal guide cells at midleaf only to the species s.1. Table 1 shows some of many combinations of character-states in H. recurvirostrum s.1. Canadian collections of Hymenostylium recuwiros trum var. insigne: British Columbia, Bridal Veil Falls Provincial Park, ca. 90 km E of Vancouver, spray of falls, Zander and Eckel 4391 (BUF, UBC), Schofield 57030, (UBC), (BUF, UBC). KEY TO VARIETIES OF Hymenostylium recurvirostrum (HEDw.) DIX. IN NORTH AMERICA 1. Leaves to 2.0 mm long; costa subpercurrent to percurrent, guide cells 2-4, adaxial epidermal cells seldom differentiated; stems occasionally papillose; widely distributed var. recurvirostrurn 1. Leaves mm long; costa excurrent, guide cells 4-7, adaxial epidermal cells differentiated; stems smooth; generally of mountainous or hyperoceanic areas

3 1598 CAN. I. BOT. VOL

4 ZANDER AND ECKEL Leaves strongly reflexed above a broadened base, upper marginal cells bistratose in patches; laminal papillae mostly bifid, often crowded; Scotland; British Columbia, Canada; Japan; Yunnan, China; Bhutan, India var. insigne(dix.)bartr. 2. Leaves little reflexed, base not strongly widened, upper marginal cells unistratose; laminal papillae simple, scattered; West Indies; Central America; Mexico; Hawaii; Japan; Yunnan, China; Himalayas var. cylindricurn(bartr.)zand. Hymenostylium recurvirostrum var. cylindricum (Bartr.) Zand., comb. nov. Hymenostylium glaucum var. cylindricum Bart., J. Wash. Acad. Sci. 26: , basionym. TYPE: Jamaica, Farm Hill Works, Orcutt 5461 (FH! holotype; PC! isotype). Although West Indian specimens of H. recurvirostrum differ significantly in extreme forms from most continental collections, no satisfactory circumscription of a West Indian taxon could be made by Zander (1977) that allowed "practical identification of a majority of specimens" to variety. Inasmuch as biological discussions of the West Indian variant would be facilitated by having a scientific name available for use, a combination with the earliest varietal epithet whose type is clearly characteristic of the West Indian populations is provided above. The var. cylindricum is surely equivalent to Saito's (1975) concept of Hymentostylium aurantiacum (Mitt.) Par. in Japan, China, the Himalayas, and the Phillipines judging from descriptions and a few specimens examined, anc! to Molendoa crassinervis (Broth.) Bartr. of U.S.A.: Hawaiian Islands, Hawaii, s. loc., Hillebrand s.n. (H! holotype; FH! isotype) and specimens ex herb. W. J. Hoe. There are two other commonly recognized varieties of H. recurvirostrum. The var. latifolium (Zett.) Crum (syn.: Gymnostomum recurvirostrum var. scabrum (Lindb.) Grout) is characterized by papillose stems; these are said to be correlated with broader, more papillose leaves. Certain authors (e.g., Saito 1975; Crum and Anderson 1981) were little impressed with this as a taxon, citing poor correlation of stem and laminal papillae development, and lack of a geographical range distinct from that of the typical variety. Leaf shape is, in fact, not a very good character for this variety, and, although papillose stems may well be genetically determined, this character-state alone is not sufficient basis for a taxon. The var. commutatum (Mitt.) Pod?., characterized by elongate upper laminal cells, intergrades in that respect, at least in New World material, with all varieties recognized here. In all the varieties, elongate upper laminal cells are often found in perichaetial leaves of specimens with subquadrate upper laminal cells of cauline leaves. The elongate upper laminal cells of cauline leaves in H. recurvirostrum may be due to an extension of the developmental influence controlling the shape of the laminal cells of perichaetial leaves. Neither the var. latifolium nor the var. commutatum are recognized here. Of particular interest is our observation that clumps of both (Figs. 1-13) var. insigne and var. recurvirostrum (with strongly papillose stems, Zander and Eckel4389 (BUF, UBC) were growing at Bridal Veil Falls. No morphologically intermediate specimens were found. Fruiting plants were occasionally present in var. recurvirostrum, but only very young perichaetia were found, rarely, in var. insigne. Barbula amplexifolia (Mitt.) Jaeg., another species of Pottiaceae found at the Falls, proves to be a new record for British Columbia. This station helps fill in a north-south disjunctive distribution in the New World between the Northwest Territories, Alaska, and Arizona (Zander 19796). SPECIMEN EXAMINED: BRITISH COLUMBIA: Bridal Veil Falls Provincial Park, ca. 90 km E of Vancouver, muck near Falls, Zander and Eckel4394 (BUF, UBC). Acknowledgements We are grateful to W. B. Schofield for providing specimens and for comments on an early draft'of this paper. We thank the curators of the herbaria mentioned in the text for loan of specimens. CHEN, P.-C Studien iiber die ostasiatischen Arten der Pottiaceae. I. Hedwigia, 80: CRUM, H. A., and L. E. ANDERSON Mosses of eastern North America. Vol. 1. Columbia University Press, New York. GANGULEE, H. C Mosses of eastern India and adjacent regions, a monograph. Fasc. 3 (Syrrhopodontales, Pottiales and Dicranales). H. C. Gangulee, Calcutta. FIGS Hyrnenosryliurn recurvirostrum var. recurvirostrurn (variant with papillose stems). Fig. 1. Plant. x Fig. 2. Stem transverse section. X520. Fig. 3. Stem surface view. X520. Fig. 4. Leaves. x21.3. Fig. 5. Upper marginal laminal cells. X520. Fig. 6. Leaf apex. x520. Fig. 7. Transverse section at midleaf. X520. FIGS Hyrnenosrylium recurvirostrum var. insigne. Fig. 8. Plant. X Fig. 9. Stem transverse section. ~520. Fig. 12. Leaf apex. x520. Fig. 13. Transverse section at midleaf. X 520. Figs From British Columbia: Zander andeckel4389-buf: Figs From British Columbia: Zander and Eckel4391 -BUF.

5 CAN. J. BOT. VOL. 60, 1982 SAITO, K A monograph of Japanese Pottiaceae (Musci). J. Hattori Bot. Lab. 39: SMITH, A. J. E The moss flora of Britain and Ireland. Cambridge University Press, Cambridge. ZANDER, R. H The tribe Pleuroweisieae (Pottiaceae, Musci) in middle America. Bryologist, 80: a. A synopsis of Bryoerythrophyllum and Morinia (Pottiaceae) in the New World. Bryologist, 81: New combinations in Didymodon (Musci) and a key to the taxa in North America north of Mexico. Phytologia, 41: a. Molendoa hornschuchiana new to the Americas from the Pacific coast of Alaska. Bryologist, 82: Notes on Barbula and Pseudocrossidiurn (Bryopsida) in North America and an annotated key to the taxa. Phytologia, 44: