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Published In: Flora Boreali-Americana (Michaux) 2: 289. 1803. (Fl. Bor.-Amer.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/10/2009)
Acceptance : Accepted
Project Data     (Last Modified On 3/10/2009)
General Reference:

Notes     (Last Modified On 3/10/2009)
general taxon notes:
Trematodon is characterized by having long-necked capsules and vertically barred peristome teeth. Gametophytically, it is similar to Dicranella and Ditrichum. Trematodon consists of some 80 species in the world. Nine species of itwere previously reported from China. Many of the Chinese records were proved to be T. longicollis, and only two species were recognized by T. Cao and C. Gao (1988).


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31. Trematodon Michx.   长蒴藓属 chang-shuo xian shu
Fl. Bor. Amer. 2: 289. 1803.
Plants small, light green to yellowish green, gregarious or in loose tufts. Stems erect, simple or rarely branched; central strand present. Leaves usually contorted when dry, oblong to oblong-ovate at the base, gradually to abruptly narrowed from the clasping base to a long awn or linear-subulate acumen; margins entire, usually recurved in the upper part; costa strong, subpercurrent to long-excurrent; upper cells small and somewhat obscure, subquadrate to short-rectangular; lower cells at the clasping base, elongate, thin-walled, smooth; alar cells not differentiated. Autoicous. Perichaetial leaves clearly larger than the vegetative ones. Setae elongate, straight, yellowish to yellowish brown; capsules suberect, usually curved above, cylindric, the neck slender, as long as or longer than the urns, usually strumose at the base; opercula obliquely long-rostrate; annuli simple or compound; peristome absent or present, with 16 linear-lanceolate teeth, usually undivided, perforate or forked, vertically striate on outer surface. Calyptrae cucullate, smooth. Spores 20–30 µm in diameter, subreniform, distinctly papillose.

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1. Leaves abruptly narrowed from the shoulder into a long awn, costa completely filling the awn; capsule neck about as long as the urn.................................1. T. ambiguus
1. Leaves gradually narrowed from the shoulder into a linear-subulate acumen, costa not entirely filling the width of the acumen; capsule neck 2–4 times as long as urn..................................................... 2. T. longicollis 
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