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Published In: Die Musci der Flora von Buitenzorg 3: 937. 1908. (Musci Buitenzorg) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/27/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/8/2017)
Plant Category: Mosses
General Reference:

Notes     (Last Modified On 10/8/2017)

Porotrichodendron is a neotropical genus of three species (fide R.R. Ireland). In the tropical Andes found in low to typically high montane forest and shrubby páramo and humid puna. Porotrichodendron is characterized by the rather densely-foliate, erect to subpendent, frondose, secondary stems, terete-foliate branches, concave leaves, moderately long costa, 2/3-3/4 the length of leaf, and very long rostrate opercula. The genus was previously placed in the Lembophyllaceae. The taxonomic concept of species and keys to Porotrichodendron are adapted from Ireland and Allen (2010).


Porotrichodendron es un género neotropical de tres especies. Porotrichodendron se caracteriza por presentar tallos secundarios muy densamente foliados, erectos hasta subpendientes, frondosos, ramas terete-foliadas, hojas cóncavas, costa moderadamente larga, ocupado 2/3-3/4 de la longitud de la hoja y opérculo rostrado muy largo. El género fue localizado previamente en la familia Lembophyllaceae.


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Plants medium size to rather large, subdendroid to pendulous, forming soft mats or tufts, often brown to golden-brown. Primary stems creeping. Secondary stems suberect to pendent. Leaves broadly to somewhat narrowly ovate-short lanceolate, apex acute, often mucronate?, base auriculate or not; margins distally serrate; costae single, 2/3-3/4 lamina length, occasionally costa branched or spurred below; median cells linear to fusiform or rhomboidal, smooth, porose; alar cells differentiated or not. Branch leaves smaller, narrowly ovate to oblong, acuminate, auriculate or not. Dioicous. Setae elongate, to 20 mm long, smooth. Capsules erect to suberect, symmetric, urn ovoid to obloid, to 2 mm long, neck short; annulus persistent; opercula conspicuously long rostrate; peristome, with exostome teeth cross-striate at base, papillose distally; endostome densely papillose, basal membrane high, segments narrow, keeled and perforate, cilia absent or rudimentary. Calyptrae cucullate, naked, slightly roughened above. Spores not observed.


Plantas medianas hasta muy grandes, subdendroides hasta péndulas, formando matas o manojo suaves, a menudo pardo hasta pardo-doradas. Tallos primarios reptantes. Tallos secundarios suberectos hasta pendientes. Hojas anchamente hasta algo angostamente cortas ovado-lanceoladas, ápices agudos, a menudo mucronados?, bases auriculadas o no; márgenes distalmente serrados; costa simple, ocupando 2/3-3/4 de la longitud de la lámina, costa ocasionalmente ramificada o espolonada abajo; células mediales lineales hasta fusiformes o rómbicas, lisas, porosas; células alares diferenciadas o no. Hojas de las ramas menores, angostamente ovadas hasta oblongas, acuminadas, auriculadas o no. Dioicas. Setas alargadas, hasta 20 mm de largo, lisas. Cápsulas erectas hasta suberectas, simétricas, urna ovoide hasta obloide, hasta 2 mm de largo, cuello corto; anillo persistente; opérculo conspicuamente largo rostrado; peristoma, con dientes del exostoma con estrías cruzadas en la base, distalmente papiloso; endostoma densamente papiloso, membrana basal alta, segmentos angostos, carinados y perforados, cilios ausentes o rudimentarios. Caliptra cuculada, desnuda, escasamente rugosa arriba. Esporas no observadas.


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1. Secondary stem leaves concave; branch leaves ovate to oblong-ovate, very strongly concave with a short cuspid that is erect to slightly recurved … P. lindigii

1. Secondary stem leaves complanate to slightly concave; branch leaves oblong-lanceolate to oblong-ovate, moderately concave and gradually narrowed to apex or often abruptly ending in an acute apex … 2.

2. Secondary stems dendroid, arising from primary stem, plants 2-5 cm tall; branch leaves lanceolate, gradually narrowed to apex … P. bertrandii

2. Secondary stems creeping to ascending or erect from primary stem, plants 3-20 cm tall; branch leaves ovate-lanceolate to oblong-lanceolate, often abruptly narrowed to an apiculus … P. superbum



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