398 Williams: Mosses from west coast of South America 



Linn. Soc. 12: 154. 1869. It has a cross section of leaf and 

 perichaetial leaves very similar to the preceding but is a much 

 smaller species with stem leaves only about 0.5 mm. long and 

 lacking the sharp apiculate point. From P. chilense it may be at 

 once distinguished by the basal cells which are rectangular, not 

 mostly transversely elongate or square. The costa is also nar- 

 rower, about 60 fx in the widest part. It seems to be known only 

 from the Andes near Quito.] 



Desmatodon subtophaceus (R. S. Williams) comb. nov. 

 Didymodon subtophaceus R. S. Williams, Bull. N. Y. Bot. Gard. 3: 



119. 1903. 



Peru: above Arequipa, August, 19533, ' Juliaca, September, 



190Q9. 



Chile: Las Vacas, near Chiapa, October, 19230. 



The stereid band is nearly or quite lacking in the upper part 

 of the costa but present in the lower part. 

 Tortula confusa Card. 



Peru: Cuzco, September, 19519- 

 Tortula Kunzeana (CM.) Mitt. 



Chile: La Ligua, 19383; Paloma, October, 19354- 



Tortula limensis sp. nov. 



Apparently mostly autoicous but occasionally synoicous, the 

 inner perigonial leaves much smaller and paler than the outer 

 and enclosing abundant antheridia, 0.3-0.4 mm. long, with numer- 

 ous slightly longer, club-shaped paraphyses: plants in compact 

 mats with more or less branching; stems about i cm. high having 

 a very small central strand or none; stem-leaves mostly oblong, the 

 larger about 3 mm. long by 1.5 mm. wide, appressed-contorted 

 when dry, somewhat spreading, recurved when moist, with flat 

 or slightly recurved crenulate and papillose margins; costa terete, 

 slightly rough on the back, about 40 m wide in the lower part, 

 slightly tapering upward, excurrent into a reddish not quite 

 smooth hair-point sometimes over one half the length of the 

 blade, in cross-section showing 2 large guide-cells, below them a 

 stereid band and on the upper side a few thin-walled cells in two 

 layers, the upper surface finely papillose; cells of upper leaf not 

 elongate, densely papillose on both sides, 16-20 m in diameter, those 

 of basal part pale, smooth, up to 25 /x wide and 60-80 n long; inner 

 perichaetial leaves very similar to those of the stem but a little 

 larger; seta about 12 mm. long; capsule oblong, slightly curved 



