Pseudo-calliergon trifarium (F.Weber & D.Mohr) Loeske

Authority

Buck, William R. 1998. Pleurocarpous mosses of the West Indies. Mem. New York Bot. Gard. 82: 1-400.

Family

Campyliaceae

Scientific Name

Pseudo-calliergon trifarium (F.Weber & D.Mohr) Loeske

Description

Species Description - Plants medium-sized but slender, in lustrous, yellow-brown, loose tufts or as single strands among other mosses. Stems erect, simple or sparsely branched ± in a single plane; in cross-section with 1-3 rows of small thick-walled cells surrounding larger thinner-walled cells, central strand small, of small cells with thin, nodulose walls; paraphyllia absent; pseudoparaphyllia broadly foliose; axillary hairs with a single short brown basal cell and 1-2 elongate yellowish distal cells. Stem and branch leaves similar, mostly crowded, erect or appressed when dry, slightly more spreading when moist, broadly oblong-ovate, 1-1.6 mm long (to 2.25 mm extralimitally), broadly rounded at apex, concave-cucullate, not decurrent; margins crenulate at apex, entire below, incurved above, plane or narrowly incurved below; costa single, slender, ending ca. 1/2-4/5 the leaf length, rarely forked; cells linear, smooth, firm-walled, not porose, becoming shorter and irregularly shaped at extreme apex, becoming somewhat shorter and thicker-walled toward the insertion; alar cells gradually differentiated, short-rectangular, often yellowish, enlarged but not inflated, not reaching the costa. Asexual propagula none. Dioicous. [Sporophytes not known from the West Indies; description based on European material.] Perichaetia large, conspicuous; leaves erect, oblong-lanceolate, ca. 2 mm long, ± acuminate, ± plicate; margins entire, plane; costa single, slender, ending at ca. 2/3 the leaf length; cells long-hexagonal to linear, smooth, thick-walled, ± porose, becoming longer, broader, and thinner-walled below. Setae elongate, slender, smooth, red-brown, 3-5 cm long; capsules inclined, arcuate, asymmetric, broadly cylindric, 2.5-3 mm long; exothecial cells subquadrate, thick-walled, not collenchymatous, becoming oblate at the mouth; annulus of 2-4 rows of small thick-walled cells, tardily deciduous; operculum high conic-apiculate; exostome teeth yellow-brown, shouldered, strongly bordered, on the front surface cross-striolate below, coarsely papillose above, trabeculate at back; endostome papillose, with a high basal membrane, segments keeled, perforate, cilia in groups of 2-4, nodulose. Spores spherical, very finely papillose, 13-18 µm diam. Calyptrae cucullate, naked, smooth.

Discussion

1. Pseudo-calliergon trifarium (F. Weber & D. Mohr) Loeske, Hedwigia 46: 311. 1907; Hypnum trifarium F. Weber & D. Mohr, Naturh. Reise Schweden 177. 1804; Hypnum stramineum var. ß trifarium (F. Weber & D. Mohr) Schwägr., Sp. Musc. Frond. Suppl. 1(2): 212. 1816; Hypnum sarmentosum var. y trifarium (F. Weber & D. Mohr) Wahlenb., Suppl. Fl. Lapp. 67. 1826; Stereodon trifarius (F. Weber & D. Mohr) Brid., Bryol. Univ. 2: 825. 1827, comb, inval; Amblystegium trifarium (F. Weber & D. Mohr) De Not., Comment. Soc. Crittogam. Ital. 2: 289 [reprinted as: Cronaca Briol. Ital. 2: 23]. 1867; Calliergon trifarium (F. Weber & D. Mohr) Kindb., Cañad. Rec. Sci. 6: 72. 1894; Drepanocladus trifarius (F. Weber & D. Mohr) Broth, in Engl. & Prantl, Nat. Pflanzenfam. 1(3): 1035. 1908, Warnst. ex Paris, Coll. Nom. Broth. 10. 1909 [1910], comb, superfl.; Scorpidium trifarium (F. Weber & D. Mohr) H. K. G. Paul, Bryol. Z. 1: 154. 1918; Acrocladium trifarium (F. Weber & D. Mohr) P. W. Richards & E. C. Wallace, Trans. Brit. Bryol. Soc. 1(4): xxv. 1950. Plate 87, figures 1-8 Calliergon haitense Broth, ex Karczm., Monogr. Bot. 34: 17, 156. 1971 [1972], nom. nud. in syn. Discussion. The unicostate, concave-cucullate leaves on mostly erect, unbranched stems are unlike any other plant in our flora.

Distribution

Range. Northern North America, Venezuela, Greenland, northern and western Europe; Hispaniola (Dominican Republic); growing on soil, in wet, often aquatic, usually calcareous habitats; known from a single West Indian collection in the Dominican Republic, Valle Nuevo, near Constanza, 2200 m, in stream, Türckheim 8454 (H-BR!).

Canada North America| United States of America North America| Venezuela South America| Greenland North America| Europe| Dominican Republic South America|