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Published In: Bulletin of the Buffalo Society of Natural Sciences 32: 119. 1993. (Bull. Buffalo Soc. Nat. Sci.) Name publication detail

Project Name Data (Last Modified On 2/16/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/16/2011)

Although P. austrorevolutum is usually a much smaller plant than P. replicatum, the two  overlap somewhat in size. Pseudocrossidium replicatum differs from P. austrorevolutum in having yellow-orange, long-rectangular inner basal leaf cells, stems with weak sclerodermiss, costae densely papillose on the upper dorsal surface, and elongate rather than quadrate stem epidermal cells.

Pseudocrossidium obtusulum, a southern California species, and  P. austrorevolutum are similar in size, and both have the same type of inner, basal leaf areolation as well as quadrate stem epidermal cells. It differs from P. austrorevolutum in having ovate-deltoid leaves and once revolute leaf margins with undifferentiated interior cells.

Illustrations: Figure 62.
Habitat: On damp open bank; 200–500 m.
Distribution in Central America: GUATEMALA. Zacapa: Standley 74401 (F, FH).
World Range: Central America; Western South America.


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Pseudocrossidium austrorevolutum (Besch. in Britt.) Zand., Bull. Buffalo Soc. Nat. Sci. 32: 119. 1993. 

         Barbula austrorevoluta Besch. in Britt., Bull. Torrey Bot. Club 23: 480. Protologue: Bolivia. Near La Paz, 1000 ft. April, 1885 [Rusby] (3129). 

Plants small, green above, brown below, in tufts, 5–8 mm high. Stems red, not or sparsely branched, hyalodermis weakly present, central strand well-developed; rhizoids sparse. Axillary hairs 5–6 cells long, all cells hyaline. Leaves 0.8–1.2 mm long, elliptic to oblong, erect or spreading at base, spirally twisted when dry, erect-spreading to spreading when wet; apices broadly acute to obtuse-rounded, mucronate; margins spirally revolute to the apex, the interior cells of the revolute margins thin-walled, weakly papillose, hyaline or green; costa stoutly excurrent as a smooth mucro, guide cells and single (dorsal) stereid band well-developed, ventral surface layer enlarged, thin-walled, papillose; upper and basal cells not well-differentiated, upper cells in more or less regular rows, irregularly quadrate, subquadrate, hexagonal short oblate, 6–18 x12–14 μm, firm-walled, densely papillose by 4–6 crowded, c-shaped papillae, basal cells quadrate, subquadrate, to short-rectangular, firm-walled, smooth, 10–20 x 10–12 μm, hyaline or green, alar cells not differentiated. Dioicous (?). Sporophytes not seen.


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