364 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



3. Arachniopsis pecten Spruce, On Cephalozia 85. 1882. 

 Arachniopsis (M onodactylopsis) minima Schuster, Nova Hedwigia 10: 24. 1965. 



Plants hair-like, bluish-green or yellowish-green, in mats or over other bryo- 

 phytes; stems 1-2 cm long, the frequent branches ventral-intercalary, axillary, long, 

 leafy or short and bearing a male or female inflorescence; stem in transverse section 

 of 6 rows of cortical cells and 1 row of smaller cells in the medulla. Rhizoids scarce, 

 very slender, from cells of the underleaves. Leaf insertion "transverse." Leaves 0.5- 

 0.7 mm long, of 1 row of 3-5 cells, the basal cell 52-84 X 15-20 fi, the small tip cell 

 to 15 /x long, the walls uniformly thickened, the cuticle smooth. Underleaves small, 

 of two adjacent cells, each bearing a slime papilla. Plants dioicous. Male in- 

 florescence terminal becoming intercalary on a stem or long branch, the bracts bifid 

 to the base, erect-spreading, the bracteoles like the underleaves. Female inflorescence 

 terminal on a short leafy branch, the bracts and bracteoles in 3 or 4 series, the inner 

 series longest, these bracts with a short lamina and 3 or 4 long segments. Perianth 

 cylindrical below, with 3 broad keels above, the mouth long ciliate-laciniate, with 

 12 long cilia. 



PI. 97. Fig. 3, a-e. 

 Habitat: On soil over tree roots, along rivers in forests [selva]. 



VENEZUELA: Terra Amazonas: selva . . . Casiquiare, Vareschi 7799 (VEN). 



BRAZIL: Silva Amazonica: flumen Uaupes, Spruce, Hep. Sprue, (isotypes NY, G-13415) ; 

 San Gabriel and San Carlos, Spruce, Hep. Sprue., isotype of A. minima Twith Pteropsiella jrondi- 

 formis] (NY). 



4. Arachniopsis dissotrieha Spruce, On Cephalozia 86. 1882. 



Plants small, yellowish to dark green, in dense mats. Stems prostrate, to 2 cm 

 or more long, flattened, with leaves to 0.8 mm broad, often tending to become 

 flagelliform toward the tip, irregularly branched; branches frequent, ventral-inter- 

 calary, axillary, leafy or tending to become flagelliform, or short and bearing a 

 female inflorescence. Rhizoids slender, from the cells of the underleaves. Leaf inser- 

 tion oblique, the leaves succubous. Leaves of 2 widely spreading to patent segments, 

 often tending to be ascendant, flattened, the parallel, approximate, uniseriate segments 

 to 0.4 mm long, of 4 cells, the basal cell to 130 ^ long, 39 ^ wide, the small, oval 

 tip cell to 26 n long, the walls uniformly thick, the cuticle verruculose. Underleaves 

 of 2 small adjacent cells, each capped with a slime papilla. Plants dioicous. Male 

 inflorescence terminal becoming intercalary on a stem or branch, the bracts in many 

 series, like the leaves, but erect spreading and pouched at the base, the bracteoles 

 scarcely larger than the underleaves. Female inflorescence on a short branch, the 

 bracts and bracteoles in 3 or 4 series, the outer series bifid or trifid from a lamina 

 1 or 2 cells high, the inner series largest, quadrifid from a lamina 2 or 3 cells high, 

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

 long-ciliate laciniate, the cells of the long cilia 90-100 /x long. 



PI. 97. Fig. 4, a-d. 



Habitat: Over soil on tree roots in forests. 



BRAZIL: Silva Amazonica: Flumen Uaupes, Spruce, Hep. Sprue, (isotypes NY, G-13413) ; 

 prope Panure, Spruce 2905, 2944 (NY). 



PERU: Tarapoto, Rio Mayo, Spruce 4736 (NY). 



Odontoseries Fulford, gen. nov. 



Caules brunnei, ramis ventrali-intercalaribus, foliosis; caulium cortex 6-7 cellulis 

 magnis, cellulis ventralibus parvioribus, medullaque 8-10 cellulis. Rhizoidea ex 



