NO. I 



MEXICAN MOSSES THERIOT 



This is one of the finest discoveries made by Brother Arsene. The 

 genus Oreas has been regarded as monotypic ; liesides it has not been 

 known in America. 



Fig. I. — Orcas me.vicana Ther. i, 2, 3, leaves; 4, acumen; 5, margin and 

 median cells; 6, basal areolation; 7, cross-section of a leaf toward the middle; 

 8, perigonial leaves; 9, dry capsule; 10, moist capsule; 11, 12, 13, teeth of 

 peristome. 



Oreas Martiana Hoppe & Hornsch. is more robust, with stems 2 to 

 6 cm. long; the leaves are very acute, partially revolute, and long- 

 attenuate at the apex ; the costa is excurrent, and the cells are strongly 

 incrassate and completely smooth. 



SYMBLEPHARIS HELICOPHYLLA Mont. 



Yalle de Mexico: Desierto {Bro. Amahle 1246, 1254 in part). 



In these specimens the species appears under two distinct forms, 

 which are, however, rather frequently combined in the same tuft. 

 They are characterized as follows : 



(a) Forma normalis. Pedicel 10 mm. long; deoperculate capsule 

 2 mm. 



(b) Forma breviscta. Shorter pedicel (3-4 mm.) ; deoperculate 

 capsule 1.5 mm. 



I am unable to discover any other differences between these two 

 forms. 



