NO. 4 



MEXICAN MOSSES THERIOT 



come to the conclusion that they are distinct, the first belonging to 

 the subgenus Eucaiiipylopus, the second to the subgenus Pscudocampy- 

 lopiis ; furthermore, that C. Arscnci Ther. does not differ from the 

 latter. 



CAMPYLOPUS (Eucampylopus) SAINT-PIERREI Ther., sp. nov. 



Hidalgo : El Chico, on rocks, alt. 2,600 meters, leg. ]\Iarius Saint- 

 Pierre {Bro. Ainable 1589). 



Sterilis. Caespites densi. Caulis 2-^ cm. altus, simplex vel parce 

 ramosus, inferne radiculosus, basi terra obrutus, dense foliosus. Folia 

 sicca erecta, paruni fiexuosa, humida erecto-patula, lanceolata, longis- 

 sinie subulata, canaliculata, marginibus integris, apice denticulatis, 



Fig. 2. — Cauipylopiis Saiiif-Picrrci Ther. i, leaf; 2, acumen; 3, upper cells 

 at a : 4, suprabasal cells toward /' ; 5, alar cells; 6, cross-section of leaf near 

 the base; 7, section from the acumen; 8, cross-section of costa near the base. 



5-6 mm. longa, 0.7 mm. lata; costa basi 0.3 mm., breviter excurrente, 

 dorso superne sulcata, baud lamellosa ; auriculis distinctis, valde exca- 

 vatis, cellulis alaribus numerosis, minutis. vesiculosis, rete supra- 

 basilari chlurophylloso, cellulis marginalibus ( 3-4) linearibus, hyalinis, 

 sequentibus quadratis, internis rectangularibus, parietibus incrassatis, 

 sinuatis ; cellulis laminae rhomboidalibus valde incrassatis, ju.xta- 

 marginalibus minutis, juxtacostalibus sensim majoribus. 



At first sight a cross-section of the costa seems to indicate the 

 subgenus Paliiiocrospis. Under a moderate magnification this section 



