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Published In: Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 24: 246. 1897. (Bot. Jahrb. Syst.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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Discussion:

Bryum leptotorquescens is a large moss with a weakly rosulate to evenly foliate habit. Its leaves are spirally twisted to contorted when dry and often do not completely flatten out when wetted. It has decurrent leaves with sharply serrate margins that are weakly and indistinctly bordered by several rows of narrower, longer and slightly thicker‑walled cells. Its leaf cells are thin‑walled, and its costa varies from shortly excurrent to subpercurrent. Its pseudautoicous sexual condition is unusual in Bryum. Bryum richardsii also has a weakly rosulate habit and decurrent leaves, but differs from B. leptotorquescens in having a well-developed leaf limbidium. Bryum canariense and B. leptotorquescens are similar in size and in having scarcely differentiated upper leaf borders, but that species has short, thick‑walled, often porose leaf cells and crenulate leaf margins. Bryum billarderi differs from B. leptotorquescens in its strongly rosulate habit, well‑differentiated leaf border, non‑decurrent leaves, and frequent presence of papillose axillary propagula.

Illustrations: Williams (1916, Pl. 20); Thériot (1928, Fig. 5); Ochi (1972, Fig. 49); Ochi (1977, Fig. 6); Sharp et al. (1994, Fig. 367 j–m). Figure 147 E–G.
Habitat: On soil, disturbed forest with pine and rock outcrops; 2300 m.
Distribution in Central America: GUATEMALA. San Marcos: Croat 41045 (MO). EL SALVADOR. Ahuachapán: Sandoval 552 (B, MO, LAGU).
World Range: Mexico; Central America; Western South America; West‑Central and South Tropical Africa.

 

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Bryum leptotorquescens C. Müll. ex Broth., Bot. Jahrb. Syst. 24: 246. 1897.

Protologue: Cameroon. An Felsen in Bächen bei Buea Dusén 208.

Bryum biforme Williams, Bull. Torrey Bot. Club 43: 328. 1916. Protologue: Peru. Torontoy, Urubamba Valley, about 3600 m., May, 1915, Hiram Bingham 730

Bryum subelimbatum Thér., Smithsonian Misc. Collect. 81: 13. 1928. Protologue: Mexico. Puebla: Fort Lorette, alt. 2,200 m. [Arsène] 657 (US). 

Plants medium- to robust-sized, shiny, green to yellowish green, in loose tufts, 13–40 (–70) mm high, weakly rosulate to evenly foliate; rhizoids papillose, forming brownish red tomentum at base. Lower leaves distant, upper leaves crowded, 2.5–4 mm long, spirally twisted to spreading flexuose when dry, erect‑spreading when wet, oblong to broadly spathulate, long-decurrent; apices acuminate; margins recurved in lower ½, indistinctly bordered by 2–4 rows of narrower, longer, somewhat thick‑walled cells, serrate above; costae percurrent to shortly excurrent; upper cells rhomboidal‑hexagonal, thin‑walled, 30–50 μm long, basal cells broadly rectangular, thin‑walled, lax, 40–80 μm long. Sporophytes not known from Central America. Pseudautoicous; male plants 1–2 mm high, on the tomentum of female stems. Setae 2 cm long. Capsules pendulous, oblong‑pyriform, neck short and slender; opercula nearly hemispheric, apiculate; endostome with a low basal membrane, narrowly perforate segments, and well‑developed, appendiculate cilia. Spores to 20 μm, roughened (Ochi 1994).

 

 

 
 
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