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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



occasionally branched. Rhizoids frequent on the scale-leaves of the rhizomes, 

 occasionally on the underleaves. Leaves more or less imbricate, ascendent, ovate, 

 concave, the apex often curved as in Loeskea, a short wing often formed down the 

 middle of the upper part, the margins entire; cells quadrate in outline, 10-18 p,, 

 the walls uniformly thickened, trigones small, the cuticle smooth to faintly 

 verruculose. Underleaves large, smaller than the leaves, concave, orbicular to 

 truncate-ovate, never lanceolate, appressed to spreading, cells as in the leaves. 

 Male inflorescence slender, hyaline, the bracts and bracteoles in five to seven 

 series, bracts small, ovate, concave, bracteoles tiny, ovate; antheridia large, one 

 or two in the axils of the bracts. Female inflorescence from near the base of a 

 leafy branch, the bracts and bracteoles in three series, the innermost series 

 long-ovate, 0.8-1.0 mm long, the upper part ending in two or three short cilia. 

 Perianth and sporophyte not seen. PI. 56. Fig. 3, a, b. 



Habitat: On moist sandstone, rocks and ledges, and on twigs, usually in the 

 spray of waterfalls in forests. 



VENEZUELA: Estado Amazonas: Cano de Dios, 1900 m, Maguire, Cowan & Wurdack 

 30271 p.p. (NY) ; Rio Cunucunuma, Cerro Huachamacari. 1400 m, Maguire, Cowan & Wurdack 

 30332 (NY); Estado Bolivar: Chimanta Massif: Ptari-tepm w of "Cave Rock", Steyermark 

 59832 (F); e facing ss bluffs Steyermark 599U (F) ; Churi-tepui, 2050 m, Wurdack 34272 

 (lectotype NY). [Top of Mt. Duida, 2000 m, Tale 519 ? (type NY, B) as cited by Reimers, 

 p. 152, but apparently lost.] 



4. Micropterygium grand istipulum Steph. Trans. Linn. Soc. II. Bot. 6: 98. 



1901 ; Icon. Hep., Micropterygium No. 4- 



Leafy stems numerous, of small to medium size, appearing radial, greenish to 

 yellow-brown, ascending to erect from a branched rhizome, in large mats or 

 cushions, often with other bryophytes; stems 2-A cm or more long, with leaves 

 0.8-1.5 mm broad, the leaves and underleaves widely spreading, leafy branches 

 frequent, flagelliform branches numerous, from the axils of the underleaves. 

 Rhizoids abundant on the scale-leaves of the flagelliform branches. Leaves widely 

 spreading, approximate to imbricate, long ovate-acuminate, the tips sometimes 

 recurved, somewhat concave, the keel broad, rounded, the wing narrow, two to 

 four cells wide, extending from the apex to below the middle, the apex acute or 

 of two pointed cells, the margins entire or with an occasional protruding cell; 

 cells round-quadrate to rectangular, those of the apical part 15-20x18 p., the 

 walls equally thickened, the lumen rounded, trigones indistinct, the cuticle 

 smooth to finely verruculose. Underleaves similar to the leaves or slightly smaller, 

 without a wing, on less well developed stems often shorter. Plants dioicous, the 

 sexual branches short, ventral, from near the base of the stem. Male inflorescence 

 catkin-like, the bracts small, concave, hyaline, in three to five or more pairs, the 

 bracteoles small, ovate; antheridia in pairs. Female inflorescence of three or 

 four series of keeled bracts and bracteoles, bracts of the innermost series largest, 

 divided to one-fourth of the length into four long-ciliate segments. Perianth to 

 6 mm long, of two to three layers of cells, three-keeled, the mouth contracted, 

 long-ciliate, the cilia to 0.4 mm long. PI. 57. Fig. 4, a-d. 



Plate 57 



Fio. 4. Micropterygium grandislipulum. 4 a. Stem, ventral view, X45; U, underleaf. 



4 b. Cells of the dorsal margin of a leaf near the apex, X 700. 4 c. Female inflorescence and 

 perianth, X 75. 4 d. Male inflorescence [ventral-intercalary], dorsal view, X 75. 



Fig. 5. M. carinatum. 5 a. Stem, ventral view, X75; U, underleaf. 5b. Cells of the 

 dorsal lamina near the apex, X 700. 5 c. Portion of a transverse section of a stem, X 700. 



5 d. Female inflorescence and perianth, X 45. 5 e. One of the cilia of the perianth mouth, X 300. 



Fig. 6. M. exalatum. 6 a. Stem, ventral view, X 75. 6 b. Leaf cell, X 700. 

 Figures drawn from the types. 



