Edit Level R 08425
LESKEACEAE -- LEPTOPTERIGYNANDRUM
XX. LEPTOPTERIGYNANDRUM Müller Hal., Hedwigia 36: 114. 1897 * [Greek, leptos, slender, and the moss genus name Pterigynandrum]
William A. Weber
Stems small and slender, in flat, light green or brown mats; pseudoparaphyllia foliose. Stem and branch leaves similar, imbricate when dry, erect-spreading when moist, 1--1.5(--2) mm, ovate, abruptly acuminate to a very slender apex, slightly decurrent; margins plane, entire or somewhat serrulate toward the apex; costa variable, forked from the base or just beyond a short base, 1/3--1/2 leaf length, often bearing rhizoids on the adaxial surface of the leaf base; cells short-rhomboidal, firm-walled, bearing many exceedingly fine papillae (with oil immersion lens). Sexual condition probably autoicous. Perichaetial leaves erect, subulate-pointed, often serrulate at the apex. Seta scarcely 1 cm. Capsule erect, symmetric, oblong-cylindric; operculum short-conic; peristome teeth lance-subulate, papillose, with scarcely projecting lamellae, endostome consisting of short, very narrow segments from a short basal membrane; cilia lacking. Calyptra not seen.
Species 7 (1 in the flora): North America, South America,
1. Leptopterigynandrum austroalpinum Müller Hal., Hedwigia 36: 114. 1897
Stems creeping, irregularly branched, julaceous when dry; paraphyllia none. Leaf cells 20--26(--34) x (7--)10(--13) \um; alar cells quadrate to oblate-rectangular, in many rows extending distally along the leaf margin.
Non-calcareous, vertical rock faces, soil in rock crevices; moderate elevations; Alaska, Colo., N.Mex.; Mexico; South America (Argentina, Bolivia, Peru); Africa (Lesotho); Eurasia.
resembles species of Pseudoleskeella
and grows in similar habitats. However, the leaves are more appressed,
never catenulate, and the leaf cells are several times longer than wide. The tiny
leaf papillae are difficult to see without an oil immersion lens. In
SELECTED REFERENCES Gangulee, H. C. 1976. Mosses of