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Published In: Linnaea 25(3): 359. 1852. (Linnaea) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 10/18/2009)
Acceptance : Accepted
Project Data     (Last Modified On 4/14/2018)
Plant Category: Mosses
country distribution: Venezuela
EcoRegions: Tepuis
elevation: 1000-1500, 1500-2000, 2000-2500
substrate: soil
frequency: rare
General Reference:

Notes     (Last Modified On 4/14/2018)
Notes:

Ecology: Tepui region, montane; submerged in river and swampy depressions. Elevation: 1200-2120 m. Distribution: West Indies, Central America, southeast United States, and Venezuela; also China. Assigned to section Sphagnum.

Ecología: Tepui; sobre suelo mojado. Elevación: 1200-2120 m. Distribución: Costa sureste de Estados Unidos, América Central (Nicaragua), Indias Occidentales, Andes tropicales (Venezuela), también China. Asignada a la sección Sphagnum.

Sphagnum portoricense is distinguished by the club-shaped branches, cortical branch cells of nested together by funnel-like bases, and green cells of branch leaves broadly triangular in cross-section with adjacent walls of hyaline cells with fringe fibrils.


 

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Plants typically robust, dark green above, brown below. Stem cortex 3-4 layered, epidermal cells subquadrate, thin-walled, delicately fibrillose, 1-6 irregularly rounded pores, wood cylinder brown. Stem leaves lingulate, to 1.1 mm, broad, fine-meshed fringe at the apex and sides; hyaline cells often 1-2 divided, on the outer surface almost entirely resorbed, on the inner surface often showing small pores and traces of fibrils, especially near the leaf apex. Branches stout and clavate, in fascicles of 4-5 (2 spreading), cortical cells 1-layered, each nested in the one below by a funnel-like base ending in a pore, without pores at the surface, fibrillose, the inner walls densely cross-striolate. Branch leaves closely imbricate, broadly cordate-ovate, to 2.4 mm, ± cucullate-concave, roughened at back of apex, margins broadly bordered by a hyaline fringe; hyaline cells on the outer surface almost entirely resorbed in the upper part of the leaf, in the lower part with 7-10 large, elliptic commissural pores, on the inner surface with about 4 small, elliptic pores at the corners in the upper part of the leaf, in the lateral regions with pores more numerous, larger, and rounded, upper leaves much larger, denticulate along a single row of narrow cells with marginal resorption, not hyaline fringed, with hyaline cells resorbed on the outer surface in only a few apical cells; in cross-section green cells equilateral-triangular, exposed on the inner surface with narrow exposure on the outer, the inner walls of hyaline cells where they are next to the green cells usually beset with fringed fibrils (sometimes only distinct at the leaf base), hyaline cells strongly convex on the outer surface, ± plane on the inner. Crum 1984.

 
 


 

 
 
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