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Published In: Revue Bryologique, nouvelle série 1: 193. 1928. (Rev. Bryol., n.s.) Name publication detail

Project Name Data (Last Modified On 9/28/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/4/2017)
Plant Category: Mosses
country distribution: Bolivia
EcoRegions: Puna
elevation: 3000-3500
substrate: soil, rocks
frequency: rare

Notes     (Last Modified On 10/4/2017)
Ecology: Dry or desert puna; on rocks and soil covered rocks, often calcareous. Only known within the tropical Andes from Bolivia. Elevation: 3300 m (Punutuma, 20°03´S, 66°07´W). Distribution: Widespread in central and southwest United States, northern Mexico and disjunct to central northern Asia.
Jaffueliobryum marginatum Thér., collected by Monge from Punutama, is a synonym. Jaffueliobryum williamsii (Deguchi) Delgad. from Peru (Delgadillo 2000) may be found in Bolivia, it differs from J. wrightii by the percurrent to short excurrent costa, flat hair point, and partially bistratose lamina.


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Plants somewhat small to medium sized, forming loose to more commonly dense cushions. Stems erect, to ca. 10 mm tall, few branched by innovations; in cross-section outer 1-3 rows of cells small, thick-walled, inner cells large, thin-walled, central strand present. Leaves crowded, appressed when dry, erect to erect-spreading when wet, oval, obovate to oblong-obovate, 0.6-1.3 mm long (excluding hair point), concave, apex obtuse-rounded; margins plane, entire to serrate or erose near juncture with costa; costa excurrent as a short to long hair point, often equal to or longer than leaf lamina; lamina unistratose; median cells oval to oblong-oval or irregular to regular quadrate, hexagonal or rectangular; basal cells quadrate to somewhat rectangular, rather lax and thin-walled; marginal cells elongate and hyaline, or quadrate to short rectangular and smaller than inner cells. Autoicous or cryptoiocus. Perichaetial leaves similar but larger. Setae short (0.3 mm) to somewhat elongate (to 1.25 mm), smooth. Capsules immersed to short exserted, erect, ovoid, to 1 mm long; stomata at base or lower 1/3 of urn, superficial; annulus revoluble or persistent; operculum short to long rostrate; peristome teeth usually divided into 3 variously fused segments or simply perforate, spiculose. Calyptrae mitrate-campanulate, base erose or deeply lobed. Spores spherical, granulate or ruminate.


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