1968] 



LEAFY HKPATICAE OF LATIN AMERICA — PART III 



353 



the rest of the plant, more or less opaque from numerous dense yellow-brown bands 

 over the surface, the cells large, tumid, the walls thin, yellow-brown, the trigones 

 tiny, the cuticle rough. Underleaves absent, occasionally 2 slime papillae present on 

 the stem. Plants dioicous. Male inflorescence terminal becoming intercalary on the 

 stem or on a short branch, the bracts large, more or less leaf-like, inrolled-pouched 

 on the dorsal side, bracteoles absent. Female inflorescence on a short ventral branch, 

 the bracts and bracteoles in about 4 series, bifid to quadrifid. Perianth long, cylin- 

 drical below, 3-keeled above, the mouth contracted, setulose. Sporophyte not seen. 

 Type species: Trabacellula tumidula Fulford, 1968. 



Trahacellula tumidula Fulford in Steyermark, Acta Bot. Venezuelica 2: 86. 1967. 



Plants coarse, yellow-brown when dry, prostrate, in mats or scattered among other 

 bryophytes. Stems to 3 cm long, with leaves 0.8-1.0 mm wide, occasionally branched; 

 branches ventral-intercalary, leafy or short male and female; stems in transverse 

 section of a cortical layer of 10-12 large cells two or more times the diameter of 

 the many small cells of the medulla, the walls brown. Rhizoids scattered on the 

 ventral side of the stem, short brownish. Leaf insertion sublongitudinal. Leaves 

 subquadrate, 0.5-0.7 mm long, to 0.5 mm wide, plane, tending to be refuse, the upper 

 (postical) base cordate by a few cells, sometimes with a suggestion of a tooth above 

 the base, the margins crenulate, the lower base straight; leaf cells large, those of the 

 margin mostly 39-45 ju. long, 65 /x wide, those of the upper part of the leaf 45-65 X 

 45-50 fx., the walls uniformly thickened, yellow-brown, the trigones minute, the 

 cuticle coarsely roughened; all cells more or less opaque from the numerous dense 

 yellow-brown bands closely placed over the surface. Underleaves absent. Plants 

 dioicous. Male inflorescence terminal becoming intercalary on the stem or rarely 

 on a short ventral branch, the bracts in 3-5 series, nearly as large as the leaves, 

 incurved and forming a large pouch on the dorsal side of the stem; bracteoles absent. 

 Female inflorescence on a short ventral branch, the bracts and bracteoles in about 

 4 series, the bracts of the outer series bifid, of the innermost series tri- or quadrifid 

 to one-half their length, each segment often with 1 lateral tooth, the bracteoles 

 smaller, oblong undivided or bifid. Perianth long, cylindrical below, 3-keeled above, 

 the wall of one, in places of two, layers of cells, the mouth contracted, setulose. 

 Sporophyte not seen. 



PI. 92. Fig. 1, a-j. 



Habitat: Moist bases of sandstone cliffs. 



VENEZUELA: Bolivar: Sarven-tepui, between "Camp 5" and base of lower escarpment, 

 17S0-20O0 m, Wurdack 34106 p.p., 34107 (type, NY); Auyan-tepui, Rio Churun, foot of "Second 

 Wall," 1600 m, Steyermark 93821 p.p. (VEN). 



Fuscocephaloziopsis Fulford, gen. nov. 



Alobiella auct. p.p. 



Plantae grossae, olivaceae; caulium cortex cellulis magnis medulla cellulis parvi- 

 oribus trigonis magnis. Rhizoidia ventralia. Folia sublongistrorsum inserta. Folia 

 patentia, subquadrata breviter bifida, parietibus cellularum tenuibus. Amphigastria 

 obsoleta. Inflorescentia masculina terminalis vel intercalaris, bracteis magnis folii- 

 formibus, saccatis, bracteolis carentibus. Inflorescentia feminea in ramo brevi ven- 

 trali, bracteis bracteolisque in 4-6 seriebus, bifida, trifida, vel quadrifida, segmentis 

 longis triangularibus. Perianthium tubulare, ore setuloso-ciliato. 



Plants suggesting a coarse brownish, turgid Cephalozia, irregularly branched, the 

 branches ventral-intercalary, leafy, with an occasional short branch bearing a male 



