Williams: Peruvian mosses 327 



Ollantaytambo, about 3,000 m., July, 191 1, Foote 7. 

 Grimmia micro-ovata C. Miill. 



Temple of X'iracocha near Tinta, on rock, about 3,500 m., 

 April, 1915, Cook & Gilbert 206; Ollantaytambo, on rock, about 

 3,000 m., May, 1915, Cook cf Gilbert 6og. 



Grimmia ovata Web. & Mohr. 



Cuzco, on dry rock, about 3,500 m., 191 1, Foote 8. 



Grimmia rivulariopsis sp. nov. 



Dioecious, the male plant rather more slender than the fertile 

 with often 2-3 flowers scattered along the stem; the inner peri- 

 gonial leaves small, ovate, ecostate, or faintly costate, enclosing 

 rather numerous, fusiform antheridia about 0.5 mm. long, without 

 paraphyses: fruiting-plants abundantly branching, 2-3 cm. high, 

 without radicles and bearing slightly secund leaves, erect-spreading 

 when moist, mostly somewhat incurved-appressed when dry; 

 stem-leaves oblong-ovate, about 2 mm. long, rather abruptly 

 narrowed to an acute, serrulate apex, the margins entire, of a 

 double thickness of cells and rccurv-ed. from a little below the 

 apex to near the base; costa stout, percurrent, smooth on both 

 sides and flat or convex on the ventral side in the upper part; 

 cells of stem-leaves distinct, smooth, with slightly thickened, 

 scarcely or not sinuous walls, the median mostly 6 n wide by 

 6-8 Ai long, the basal more or less rectangular, 8 /x wide by 16-22 n 

 long; perichaetial leaves larger than those of the stem, about 

 3.5 mm. long, the costa of the inner leaves rather faint below, 

 widest toward the apex, not quite percurrent, the cells of the 

 lower half of leaf narrowly rectangular or linear with slightly 

 thickened, straight walls; capsule ovate, immersed, about 1.5 mm. 

 high, without stomata, a band of five or six rows of small, trans- 

 versely elongate cells about the rim, the median exothecal cells 

 scarcely or not elongate, rather irregular with scarcely thickened 

 or sinuous w^alls, up to 25 n in diameter; seta erect, scarcely one 

 half the capsule in height; peristome-teeth lanceolate, about 120 ix 

 wide at the base and 400 n high, red, papillose, entire or often split 

 at the apex or along the median line and slightly lacunose; annulus 

 none; lid convex, obliquely apiculate; calyptra little more than 

 covering the apiculus, the base cleft into several lobes. (Plate 19.) 



Ollantaytambo, about 3,000 m., on rock in stream bed, May, 

 191 5, Cook & Gilbert 753; and on rock, same place and collectors, 

 561. 



Most closely related to G. amblyophylla C. Miill. of the South 

 American species, but the apex of the leaf is very different, the 



