362 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Plants very small, confervoid, in whitish- or yellowish-green mats or over other 

 bryophytes. Stems to 2, rarely to 3 cm long, irregularly branched, the branches 

 ventral-intercalary, axillary, long, leafy, or short and bearing a female inflorescence. 

 Rhizoids from the basal cells of the underleaves, short, slender, branched at the tips. 

 Line of leaf insertion appearing transverse. Leaves bifid to the base, the 2 long 

 segments often stiff, bristle-like, widely spreading, 5-8 cells long with a very short 

 tip cell, or occasionally in the upper part of the stem the leaf of only 1 segment; 

 cells of the segment mostly 130 X 20 /x, the tip cell 13-15 ft long, the walls uniformly 

 thickened, the cuticle smooth. Underleaves very small, of two adjacent cells, each 

 capped with a slime papilla. Male and female inflorescences and sporophyte not seen. 



PI. 96. Fig. 1, a-d. 



Habitat: Unknown. 



TRINIDAD: summit of Mt. Aripo, 3000 ft, Simmonds 177 p.p. (MICH). 

 PERU: s.l., Weddell (type PC) ; Monte Campana, 1200 m, Spruce, Hep. Sprue, type of 

 A. coactilis var. capillacea (isotypes G, NY). 



2. Arachniopsis coactilis Spruce, On Cephalozia 85. 1882. 

 Arachniopsis jilijolia Spruce, ms. Hep. Sprue. 



Arachniopsis coactilis var. filifolia Spruce, On Cephalozia 85. 1882. 

 Arachniopsis filifolia Spruce, ms. Hep. Sprue. 



Plants small, confervoid, in whitish- to yellowish-green mats or over other bryo- 

 phytes. Stems to 3 cm long, irregularly branched, the branches ventral-intercalary, 

 axillary, leafy, often becoming flagelliform in part, or short leafy and bearing a 

 female inflorescence. Rhizoids short, slender, hyaline, branched at the tips, abun- 

 dant from the cells of the underleaves and the regenerant cells of the leaf tips. Leaf 

 insertion transverse. Leaves bifid to the base, the uniseriate segments filiform, 6-8 

 or 10 cells long, widely spreading, flexible and curved, capped with a small oval cell; 

 cells mostly 78-90 X 20-26 fi, the tip cell tiny, the walls uniformly thickened, the 

 cuticle smooth. Underleaves small, of 2 adjacent rounded cells, each with an elongate 

 erect slime papilla above. Plants monoicous and dioicous. Male inflorescence ter- 

 minal becoming intercalary on a stem or branch, the bracts and bracteoles compact, 

 in many series, the bracts long, bifid to the base, erect-spreading, the bracteoles 

 similar to the underleaves. Female inflorescence on a short leafy branch, the bracts 

 and bracteoles in 3 or 4 series, with a lamina 1 to 3 rows of cells high, the outer 

 series bifid or trifid, the inner series largest, quadrifid, the segments long, 2 cells 

 wide below. Perianth long, cylindrical below, with 3 broad keels above, the mouth 

 ciliate-laciniate, the long cilia of many long cells. Regeneration from the tip cell or 

 from small cells cut off from near the tip of the leaf segment; rhizoids abundant 

 before these become detached. Sporophyte not seen. 



PI. 96. Fig. 2, a-k. 



Habitat: On decayed logs, over humus, rocks, on tree bases and trunks or among 

 other bryophytes in humid forests. 



COLOMBIA: Amazonas: Rio Caqueta, La Pedrera, Schultes & Cabrera 17818 p.p. (FH) ; 

 Vaupes: Rio Papure, Teresita, Schultes & Cabrera 19456 (FH) ; Rio Paca, VVacaricuara, 650 ft, 

 Schultes & Cabrera 19506 p.p. (FH). 



VENEZUELA: Amazonas: Serrania Paru, Cano Asisa, Rio Ventuari, 2000 m. Cowan & 

 Wurdack 31321 p.p. (NY) ; Cerro Huachamacari, Rio Cunucunuma, Cano de Dios, 1800 m, 

 Cowan, Wurdack & Maguire 30269 p.p. (NY) ; same locailty, near "Camp II," 1200 m, Cowan, 

 Wurdack & Maguire 29905 p.p. (NY). 



BRAZIL: Panure, fl. Uaupes, Spruce, Hep. Sprue. (G-13410, NY) ; San Carlos del Rio Negro, 

 Spruce, Hep. Sprue, (isotype NY) ; Fl. Negro et Uaupes, Spruce, Hep. Sprue, type of A. filifolia 

 (isotypes NY, G-13414). 



