382 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Cladomastigum Fulford in Steyermark, Acta Bot. Venezuelica 2: 80. 1967. 

 The characters of the genus are those of the species. 

 Type species: Cladomastigum bijidum Fulford. 



1. Cladomastigum bifidum Fulford in Steyermark, Acta Bot. Venezuelica 2: 80. 



/. 1, 2. 1967. 



Plants small, light green to whitish-green, prostrate, in dense mats or among 

 other bryophytes. Stems to 2 cm long, with leaves to 0.6 mm wide, sometimes 

 becoming small-leaved radial toward the tip, irregularly branched; branches fre- 

 quent, ventral-intercalary, in the axils of the underleaves, long, leafy or flagelliform, 

 or short male and female; stem in transverse section 7-12 cells across, the cells 

 mostly large, the cortical layer with thicker walls than the cells of the medulla. 

 Rhizoids from the ventral side of the stem. Line of leaf insertion oblique. Leaves 

 subimbricate, rectangular to ovate-truncate in outline, widely spreading, plane, 

 0.33-0.38 mm long, bifid to one-third their length, the segments often unequal, 

 triangular from a 3- to 5-celled base, ending in a uniseriate tip three to five cells 

 long, the margin crenulate; leaf cells at the base of a segment 18-27 X 27 the 

 marginal row often smaller, the walls uniformly thickened, the thickening as a 

 whitish ring within the cells, the trigones not distinct, the cuticle coarsely verrucu- 

 lose and with scattered larger papillae. Underleaves rather large, not as wide as the 

 stem, oblong-ovate, bifid to three-fourths their length, the lamina with a small 

 projection on each side. Plants dioicous. Male inflorescence short, catkin-like, the 

 bracts and bracteoles in 3-6 series, the bracts concave, with a fold bent up on the 

 dorsal side, the bracteoles smaller than the underleaves; antheridia large, in the axils 

 of bracts. Female inflorescence on a short ventral branch, the bracts and bracteoles 

 in 3 or 4 series, bifid, the innermost series largest, the bracts of this series with a 

 lateral tooth on the upper margins. Perianth 1.5 mm long, cylindrical below, 3- 

 keeled above, of 1 layer of cells, the mouth contracted, the 3 lobes ciliate and 

 laciniate. Sporophyte not seen. 



PI. 104. Fig. 1, a-j. 



Habitat: In mats on sandy banks, cliff faces or among other bryophytes on trees. 



VENEZUELA: Amazonas: Cerro Huachamacari, Rio Cunucunuma, Cano de Dios, 1900 m, 

 Maguire, Cowan & Wurdack 30276 p.p., 30277 (NY). Bolivar: Auyan-tepui, Rio Churiin, s e 

 sureste der 'Second Wall,' 1690 m, Steyermark 93296, 93299, 93300 (type), alt. 2150-2200 m, 

 Steyermark 94056, 94058 (VEN). Chimanta Massif, Abacapa-tepui, 1300 m, Steyermark 75217 

 p.p. (NY); Torono-tepui, 1910-1970 m, Steyermark & Wurdack 975 p.p. (NY). 



phycolepidoziaceae Schuster, Bull. Torrey Club 93: 442. 1966. 11 



Gametophyte a caudex- or stolon-like terete green axis, sparingly branched, the 

 branches intercalary, stolon-like or short male and female. Rhizoids from the ventral 

 side of the axis. Leaves and underleaves absent. Male inflorescence bud-like, foli- 

 aceous, terminal becoming intercalary on the axis; bracteoles absent. Female bracts 

 foliaceous in 2 or 3 series, small, bifid. Perianth trigonous above, the mouth 6-lobed. 

 Seta in transverse section of 4 rows of large external cells surrounding 4 rows of tiny 

 internal cells. Capsule wall very thin, 2-layered; spores small; elaters attenuate, 

 bispiral. 



Type genus: Phycolepidozia Schuster, 1966. 



These descriptions are compiled from Schuster, 1966. 



