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Published In: Die Musci der Flora von Buitenzorg 1: 309. 1904. (Musci Buitenzorg) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/15/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/15/2011)

Gymnostomiella occupies an isolated position within the Pottiaceae. Zander (1993) considered it “.. without obvious close relatives, ..” and positioned it in the subfamily Merceyoideae tribe Barbulae between Scopelophila and Didymodon. He also noted a possible relationship of the genus to the subfamily Pottioideae through Chenia and Hennediella. Unusual features of the genus in Central America include its moniliform axillary hairs and ellipsoid gemmae often clustered in terminal cups. The absence of costal stereid cells, a stem central strand, and perichaetial/perigonial paraphyses are also distinctive features of the genus. Zander (1993) attributed central, substereid cells to the costa, a large central strand in the stem, variably present stomata, and moniliform perichaetial paraphyses to the genus world-wide.

Gymnostomiella and Splachnobryum have often been associated (Fleischer 1923, Brotherus 1924, Bartram 1939, Crum & Bartram 1958, Breen 1963, Gangulee 1974, Crum & Anderson 1981) because they have similar leaf shapes, costal forms, leaf areolation, and lack perichaetial/perigonial paraphyses. Splachnobryum differs from Gymnostomiella in having smooth leaf cells, clavate axillary hairs, anacrogynous development, naked archegonia, conic opercula, and a haplolepideous peristome (Allen & Pursell 2000).

Gymnostomiella was revised in the Neotropics and eastern Asia by Redfearn (1991). Arts (1998) provided a world-wide revision of the genus.


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Gymnostomiella Fleisch., Musci Buitenzorg 1: 309. 1904.

Pottia sect. Splachnobryella C. Müll., Gen Musc. Frond. 389. 1901 [1900]. 

Plants very small, delicate, in tufts or mats. Stems simple or forked, central strand absent; rhizoids sparse at base of stem. Axillary hairs moniliform. Leaves oblong-obovate to elliptic, spreading or erect at base, more or less rosulate, erect when dry, erect-spreading when wet; apices  broadly rounded to obtuse; margins plane; costa slender, ending well below the apex, often spurred above, upper ventral superficial cells elongate, stereid cells absent, cells homogeneous; upper cells irregularly hexagonal, subquadrate to short-rectangular, thin-walled, translucent, with 1-4 simple papillae, basal cells long-rectangular, hyaline, smooth, alar cells not differentiated. Dioicous.  Perichaetia and perigonia terminal, paraphyses absent. Setae elongate, smooth. Capsules ovoid, erect, smooth; exothecial cells hexagonal, thin-walled; stomata in neck; opercula obliquely rostrate; annuli rudimentary, at times adhering to the capsule mouth after dehiscence; peristome absent. Spores smooth to lightly roughened. Calyptrae cucullate.

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