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!Donnellia Austin Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Bulletin of the Torrey Botanical Club 7(2): 15–16. 1880. (Bull. Torrey Bot. Club) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 9/23/2009)
Acceptance : Accepted
Project Data     (Last Modified On 11/15/2012)
General Reference:

Notes     (Last Modified On 11/15/2012)
Notes:

Donnellia is a neotropical genus of six species. Buck (1982) has discussed the relationship of Donnellia and Meiothecium; the former genus exhibits an exostome that is closely spaced, smooth and trabeculate with a fragile endostome, the latter exhibits an exostome that is widely spaced and papillose, and lacks an endostome.

 

Donnellia es un género neotropical de seis especies. Buck (1982) discutió las relaciones entre Donnellia y Meiothecium; el primer género exhibe un exostoma poco espaciado, liso y trabeculado con un endostoma frágil, el último exhibe un exostoma ampliamente espaciado y papiloso, y sin endostoma.


 

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Plants small, forming tufts or mats, glossy green to yellowish. Stems creeping to subascending distally, radiculose below; central strand absent;, rhizoids clustered. Leaves often homomallous, erect-spreading, ovate- to oblong-lanceolate, 0.6-2 mm long, to 0.6 mm wide, concave, weakly biplicate at base, apex gradually acuminate, bluntly rounded; margins plane above, at base reflexed on one or both sides, entire; costa absent; median cells rhomboidal-rounded, smooth, thick-walled; basal cells weakly porose; insertion cells golden; alar cells subquadrate to short oblong, little inflated, in 1-2 rows, golden-yellow. Autoicous. Perigonia bud-like; leaves ovate, acute. Perichaetial leaves similar. Setae rather short to elongate, ca. 2.5-8 mm long, erect to somewhat flexuose, smooth. Capsules, erect to suberect, urn obloid to ovoid-cylindrical, 1-2 mm long, constricted below mouth when dry and deoperculate; exothecial cells collenchymatous; stomata several at urn base, superficial; opercula conic long rostrate; peristome double, exostome teeth 16, hyaline, blunt, trabeculate, plate walls prominent on both surfaces; endostome basal membrane short, segments very slender, weakly keeled, lightly papillose, fragile and readily deciduous. Calyptrae cucullate, naked and smooth. Spores spherical to ovoid, lightly papillose.
 
Plantas pequeñas, formando manojos o tapices, verde brillantes a amarillentas. Tallos reptantes a subascendentes distalmente, radiculosos abajo; cordón central ausente; rizoides agrupados. Hojas generalmente homómalas, erecto-extendidas, ovadas- a oblongo-lanceoladas, 0.6-2 mm de largo, hasta 0.6 mm de ancho, cóncavas, levemente biplicadas en la base, ápice gradualmente acuminado, obtusamente redondeado; márgenes planos arriba, reflexos en la base en uno o ambos lados, enteros; costa ausente; células mediales romboidal-redondeadas, lisas, con paredes gruesas; células basales levemente porosas; células de la inserción doradas; células alares subcuadradas a corto-oblongas, poco infladas, en 1-2 hileras, amarillo-doradas. Autoicas. Perigonios gemiformes; hojas ovadas, agudas. Periquecios con hojas similares. Setas algo cortas a alargadas, aprox. 2.5-8 mm de largo, erectas a algo flexuosas, lisas. Cápsulas, erectas a suberectas, urna oblada a ovoide-cilíndrica, 1-2 mm de largo, constricta debajo de la boca cuando seca y desoperculada; células exoteciales colenquimatosas; estomas varios en la base de la urna, superficiales; opérculo cónico, largo-rostrado; peristoma doble, dientes del exostoma 16, hialinos, obtusos, trabeculados, láminas de las paredes prominentes en ambas superficies; membrana basal del endostoma corta, segmentos muy delgados, levemente plegados, ligeramente papilosos, frágiles y fácilmente deciduos. Caliptra cuculada, lisa y desnuda. Esporas esféricas a ovoides, ligeramente papilosas.
 

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1. Alar cells mostly differentiated in two rows, with the cells considerably enlarged from the supra-alar cells; endostome not readily shed; leaves (1.2)1.5-2.0 mm long; setae (5)7-8 mm long … D. lageniformis
1. Alar cells differentiated in a single row, with the cells mostly small and not much larger than the supra-alar cells; endostome readily shed; leaves 0.6-1.1 mm long; setae 2.5-3.5(5) mm long … D. commutata
 
1. Células alares mayormente diferenciadas en dos hileras, con las células considerablemente más grandes que las células supra-alares; endostoma no desprendiéndose rápidamente; hojas (1.2)1.5-2.0 mm de largo; setas de (5)7-8 mm de largo … D. lageniformis
1. Células alares diferenciadas en una sola hilera, con las células mayormente pequeñas y no mucho más grandes que las células supra-alares; endostoma desprendiéndose rápidamente; hojas 0.6-1.1 mm de largo; setas de 2.5-3.5(5) mm de largo … D. commutata
 
 
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