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Published In: Journal of the Linnean Society, Botany 10: 181. 1868. (J. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/24/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/7/2017)
Plant Category: Mosses

Notes     (Last Modified On 10/7/2017)
A pantropical genus of over 100 species with the greatest diversity in tropical Asia; about 10-15 species in the Neotropics. In the tropical Andes found on logs, humus and soil in moist in wet lowland to mid montane forest. Trichosteleum is very similar to Sematophyllum except for the unipapillose laminal cells, although in that genus there is considerable more variation. The papillae are occasionally so faint in some Trichosteleum species that such species are readily misidentified as Sematophyllum. Acroporium occasionally exhibits unipapillose laminal cells, but the leaves are deeply concave and alar cells are distinctly obliquely arranged. Trichosteleum is much in need of definition and revision; see comments under Sematophyllum.
Este es un género Pantropical de más de 100 especies con la mayor diversidad en Asia tropical; cerca de 10-15 especies en el Neotrópico. En los Andes Tropicales es encontrada en leños, humus y suelo desde tierras bajas húmedas a muy húmedas hasta bosques montanos medios. Trichosteleum es muy similar a Sematophyllum excepto por las células de la lámina unipapilosas, aunque hay una considerablemente mayor variación en el género. Las papilas ocasionalmente son tan leves en algunas especies de Trichosteleum que estas especies son fácilmente confundidas con Sematophyllum. Acroporium ocasionalmente presenta células de la lámina unipapilosas, pero las hojas son profundamente cóncavas y las células alares están ordenadas en forma claramente oblicua. Trichosteleum está muy necesitado de una definición y revisión; ver comentarios bajo Sematophyllum.


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Plants somewhat small to medium sized, forming loose to dense mats, light green to yellowish-green or golden. Stems and branches spreading to short ascending; in cross-section outer 2-3 rows of cells small, thick-walled, inner cells large, thin- to rather thick-walled, central strand absent; radiculose. Leaves erect to erect-spreading, often homomallous, occasionally falcate, oblong to oblong-lanceolate, apex acute to short or long acuminate, often abruptly so; margins usually reflexed or at base recurved, dentate to more commonly serrate or serrulate; ecostate; median cells linear, often vermicular, or fusiform to rhomboidal, strongly to weakly unipapillose, papillae over cell lumen; alar region differentiated, cells inflated, oval to oblong, often golden red. Gemmae absent. Autoicous. Perichaetia lateral; leaves differentiated. Setae elongate, slender and wiry, often twisted, smooth or weakly papillose distally. Capsules inclined to horizontal, urn ovoid, constricted below urn mouth; exothecial cells collenchymatous; stomata at urn base, superficial; opercula conic-rostrate; peristome double, exostome teeth 16, cross-striate below, distally papillose; endostome segments keeled, lightly papillose. Calyptrae cucullate, smooth and naked. Spores spherical, lightly papillose.


Plantas algo pequeñas a medianas, formando matas laxas a densas, verdes claras a verde-amarillentas o doradas. Tallos y ramas patentes a corto ascendentes; en corte transversal 2-3 filas externas de células pequeñas, con paredes gruesas, células internas grandes, con paredes delgadas- a bastante gruesas, cordón central ausente; radiculosos. Hojas erectas a erecto-extendidas, a menudo homomalas, ocasionalmente falcadas, oblongas a oblongo-lanceoladas, ápices agudos a corto o largo acuminados, a menudo abruptamente; márgenes generalmente reflexos o recurvados en la base, dentados a más comúnmente serrados o serrulados; ecostadas; células mediales lineales, a menudo vermiculares, o fusiformes a rómbicas, marcadamente a débilmente unipapilosas, papilas sobre el lumen celular; región alar diferenciada, células infladas, ovales a oblongas, a menudo doradas rojas. Yemas ausentes. Autoicas. Periquecios laterales; hojas diferenciadas. Setas alargadas, delgadas y alambrinas, a menudo torcidas, lisas o débilmente papilosas en la porción distal. Cápsulas inclinadas a horizontales, urna ovoide, constricta debajo de la boca de la urna; células exoteciales colenquimatosas; estomas en la base de la urna, superficiales; opérculo cónico-rostrado; peristoma doble, exostoma con 16 dientes, estrías cruzadas abajo, distalmente papilosos; endostoma con segmentos carinados, ligeramente papilosos. Caliptra cuculada, lisa y desnuda. Esporas esféricas, ligeramente papilosas.


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Keys semi-functional; require revision.


1. Leaves distinctly falcate-secund … 2.

1. Leaves straight/erect, rarely weakly falcate … 3.

2. Laminal cells weakly unipapillose or papillae few distally … T. cyparissoides

2. Laminal cells distinctly unipapillose … T. schlimii (see also T. microcarpum)

3. Leaf margins strongly serrate; papillae weak and indistinct … T. mastopomatoides

3. Leaf margins entire to distally serrulate; papillae often strong, distinct … 4.

4. Leaf apices abruptly narrowly acuminate, channeled … T. papillosum

4. Leaf apices broadly acute, rarely acuminate … T. fluviale



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