10 THE HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Taxithelium planum (Brid.) Mitt., Jour. Linn. Soc, Bot. 12:496. 

 1869. 



On decaying wood and moist soil, Cabita Bay, Cape Corrientes, 

 Choco, Colombia; February 13, 1934; W. R. Taylor No. 1075-b: 

 Bahia Honda, Panama (west coast); February 21, 1934; W. R. 

 Taylor No. iioi. 



Distribution: Widespread throughout the American tropics. 



Sematophyllum caespitosum (Sw.) Mitt., Jour. Linn. Soc, Bot. 

 12:479. 1869. 



On moist soil, Cabita Bay, Cape Corrientes, Choco, Colombia; 

 February 13, 1934; W. R. Taylor No. 1074. 



Distribution: Florida; Mexico; West Indies; Central and South 

 America; Africa. 



Hypnaceae 



Vesicularia amphibola (Spruce) Broth., Engl.-Prantl, Pflanzen- 

 fam. 1(3): 1094. 1908. 



On soil, Cabita Bay, Cape Corrientes, Choco, Colombia; February 

 13, 1934; W. R. Taylor Nos. losg, 1044. 



Distribution: Florida; West Indies; Central and South America. 



Rhacopilopsis trinitensis (C. Miill.) E. G. Britt. et Dixon, 

 Jour. Bot. 60:88. 1922. [R. Pechuelii (C. Miill.) Card. Rev. Bryol. 

 40:19. 1913]. 



On tree in forest, Bahia Honda, Panama (west coast) ; February 

 21, 1934; W. R. Taylor No. mo. (PI. 1, figs. 4-5) 



Dr. Taylor's specimens of this species, which is as unusual in its 

 appearance as in its geographical distribution, differ rather sharply 

 from the several collections in the Herbarium of the New York 

 Botanical Garden. Although the serrate, dimorphic, asymmetric 

 leaves with well-marked and frequently Inflated alar cells allow it to 

 be placed in no other genus, these plants are smaller and more 

 lax than the others examined, and possess, in addition, attenuate 

 branches. Both dorsal and ventral leaves are narrower than the 

 descriptions and illustrations would indicate (for instance, those of 

 Brotherus, 1925), and the ventral leaves have conspicuously recurved 

 margins, instead of plane margins (figs. 4 and 5). Rhacopilopsis 

 trinitensis is known to vary widely, however, as demonstrated by its 

 ample synonymy. It seems advisable to wait until more American 



