(124) 
This genus of Grimmieae is near Indusiella Broth. & C. 
Miill., found in very similar situations in Turkestan, but Zz- 
dustella differs in having no central strand, no lamellae on 
the costa and the teeth of peristome more or less divided into 
3 segments. 
Aligrimmia Peruviana sp. nov. 
Tufts dull green: stems about 225 in diameter, central 
strand 80 in diameter : leaves closely imbricated, erect when 
dry, spreading when moist, ovate-lanceolate, 1-1.5 mm. long, 
smooth, entire, incurved above, obtusely pointed; costa ex- 
tending to near apex, about 20/ wide at base with 8 or 10 
lamellae up to 6 cells high on ventral surface; leaf-cells be- 
low square to short rectangular, 12-16 » wide, above smaller 
and roundish: seta up to 2 mm. high, with erect, oblong, 
smooth capsule scarcely 1 mm. long, bearing a conical, 
erectly rostrate lid nearly as long; annulus large, well de- 
veloped ; teeth of peristome lanceolate, erect, reddish-brown, 
papillose, entire or more or less divided along the median 
line with articulations indistinct; calyptra mitrate, smooth 
above, plicate one half up, lobate at base: spores smooth, up 
to 12 # in diameter. 
Arequipa, 2250 meters, on dry rock, August 8, 1901 (2820). 
Grimmia ANDINA Mitt. 
Juliaca, Peru, 3780 meters, on sandstone, May 16, 1902 
(28127). 
Grimmia (Tricostatae subgen. nov.) trinervis sp. nov. 
Dioicous. Plants incompact, grayish-green, loosely coher- 
ing cushions: stems fasciculately branching, up to 1 cm. 
high: leaves closely imbricated, erect when dry, spreading 
when moist, all smooth, entire, with smooth hair-point, the 
lower oblong-lanceolate, 0.75-1 mm. long with hair-point 
about one half as long, the upper and perichaetial broadly 
ovate-lanceolate, up to 1.5 mm. long, with hair-point some- 
show 2 guide-cells in primary costa with 1 or sometimes 2 
