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Published In: Mémoires de la Société des Sciences Naturelles et Mathématiques de Cherbourg 16: 161. 1872. (Mém. Soc. Sci. Nat. Math. Cherbourg) Name publication detail

Project Name Data (Last Modified On 11/18/2009)
Acceptance : provisional
Project Data     (Last Modified On 10/28/2017)
Plant Category: Moss

Notes     (Last Modified On 10/28/2017)
general taxon notes:

Microdus is a pantropical genus of far fewer than the some 40 species recognized; about 10 or fewer species in the Neotropics. Lowland to mid open montane sites in the tropical Andes; on soil, apparently not uncommon in sites associated with human disturbance, pastures, road banks, etc. Species of this genus are poorly known in the Andes, partly due to their inconspicuous small size; it could be stated that the “Status Uknown” applies to nearly all listed species. This genus is essentially a small Dicranella with mostly erect leaves and a short peristome. According to Ochyra (1997) Leptotrichella has priority over Microdus. Several authors include Microdus in Dicranella; future treatment for Bolivia will include Microdus in Dicranella.


Microdus es un género pantropical con menos de 40 especies reconocidas; ca. 10 o menos especies en el Neotrópico. Tierras bajas hasta sitios abiertos del bosque montano en los Andes tropicales; sobre suelo, aparentemente frecuente en sitios asociados con disturbios humanos, pasturas, taludes de caminos, etc. Las especies de este género son poco conocidas en los Andes, en parte debido a su tamaño reducido; casi todas las especies pueden ser categorizadas como "estado desconocido". Este género es parecido a una Dicranella pequeña generalmente con hojas erectas y peristoma corto. De acuerdo a Ochyra (1997) Leptotrichella tiene prioridad sobre Microdus. Varios autores incluyen a Microdus en Dicranella; el futuro tratamiento  de los musgos de Bolivia incluirá a Microdus en Dicranella.


Status Unknow:


Microdus kunzeanus (Müll. Hal.) Broth., Nat. Pflanzenfam. (ed. 2) 10: 181. 1924. Leptotrichum kunzeanum Müll. Hal., Bot. Zeitung (Berlin) 5: 806. 1847. Dicranella kunzeana (Müll. Hal.) Mitt., J. Linn. Soc., Bot. 12: 34. 1869. Reported for Peru and Bolivia.

Microdus nanocarpus (Müll. Hal. ex E. Britton) Paris, Index Bryol. (ed. 2) 3: 239. 1905. Dicranella nanocarpa Müll. Hal. ex E. Britton, Bull. Torrey Bot. Club 23: 475. 1896. Aongstroemia nanocarpa (Müll. Hal. ex E. Britton) Müll. Hal., Nuovo Giorn. Bot. Ital. n. s. 4: 38. 1897. Type: Bolivia. Near Yungas, 4000 ft. Rusby 3139 p.p. Only known from the Bolivian type locality at 2100 m elevation.

Reference List     (Last Modified On 10/28/2017)


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Plants small, solitary or forming short tufts. Stems erect, simple or few branched; central strand present. Leaves erect to appressed, ovate- to triangular-lanceolate or -subulate, or narrowly to ± broadly oblong-ligulate, apex acute to obtuse-rounded; margins partially inflexed to reflexed, entire to distally dentate or serrate; costae single, rather strong, ending below apex; median cells rectangular to subquadrate, smooth; lower and basal cells larger, rectangular; alar region undifferentiated. Autoicous. Perichaetia terminal; leaves similar or larger and elongate. Setae elongate, smooth, twisted or not. Capsules erect or suberect to horizontal, urn short ovoid-cylindrical to globose; exothecial cells thick-walled; annuli present; peristome single, teeth 16, entire or divided irregular to near base, usually less than 200 µm, blunt, vertically striate-papillose. Calyptrae cucullate, smooth and naked. Spores finely to coarsely papillose.


Plantas pequeñas, solitarias o formando manojos cortos. Tallos erectos, simples o poco ramificados; con cordón central. Hojas erectas hasta adpresas, ovado- a triangular-lanceoladas o -subuladas, o angostamente hasta ± anchamente oblongo-liguladas, ápices agudos hasta obtuso-redondeados; márgenes parcialmente inflexos hasta reflexos, enteros hasta distalmente dentados o serrados; costa simple, bastante fuerte, terminando debajo del ápice; células de la porción media rectangulares hasta subcuadradas, lisas; células inferiores y basales mayores, rectangulares; región alar indiferenciada. Autoicas. Periquecios terminales; hojas similares o mayores y alargadas. Setas alargadas, lisas, torcidas o no. Cápsulas erectas o suberectas hasta horizontales, urna corta ovoide-cilíndrica hasta globosa; células exoteciales con paredes gruesas; con anillo; peristoma simple, con 16 dientes, enteros o partidos de manera irregular cerca de la base, generalmente menores de 200 µm, obtusos, verticalmente estriado-papilosos. Caliptra cuculada, lisa y desnuda. Esporas finamente a gruesamente papilosas.

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