326 WILLIAMS: PERUVIAN MOSSES 
Mitten was correct, I believe, in thinking B. apiculata Hampe 
not distinct from this species. 
BARBULA SUBULATULA C. Miill. 
Urubamba, on damp earth, 2,900 m., July, 1911, Foote 5. 
TORTULA AFFINIS Hampe. 
Sicuani, Vilcanota Valley, on stone, about 3,600 m., April, 
1915, Cook & Gilbert 157; Ollantaytambo, on rock, about 3,000 
m., May, 1915, Cook & Gilbert 612; Urubamba, on rock, 2,900 m., 
July, 1911, Foote 6. 
Tortula bipedicellata Besch. and T. confusa Card., I believe, do 
not differ from T. affinis, which in turn is very close to T. pichin- 
chensis (Tayl.) Mitt., differing chiefly in having a low basal mem- 
brane of the peristome, the cell structure of which also varies. 
In T. pichinchensis the cells are often as high as broad, and some- 
what rhomboidal in slightly oblique rows; in T. affinis the cells 
are low, mostly two or three times broader than high. 
TORTULA ANDICOLA Mont. 
Ollantaytambo, about 3,000 m., May, 1915, Cook & Gilbert 771. 
Tortula lacerifolia sp. nov. 
Dioecious: plants with stems (in this small collection scattered 
through cushions of Fabronia andina) mostly simple, 6-8 ™™- 
high, with radicles at the base and leaves more or less aggregate 
toward the apex; stem-leaves twisting incurved when dry, erect- 
spreading when moist, oblong, mostly 2—2.5 mm. long, the margins - 
usually deeply incised in the upper half into readily separating, 
narrow, irregular segments, often 0.25 mm. long and twisted part 
way round or inflexed or reflexed, the margins of the lower leaf 
being entire and recurved; costa golden-brown, stout, near the 
base 80 u wide, smooth on the back, more or less papillose on the 
upper side, excurrent into a thorn-like spine, in cross-section 
showing two large guide-cells, a large band of stereid cells on the 
dorsal side, with two medium-sized cells on the ventral side; cells 
throughout upper leaf rather obscure, mostly hexagonal, mamillose 
and covered on both sides with small often C-shaped papillae, 
those of lower leaf pale, with few or no papillae and mostly short- 
rectangular, up to about 18 u wide by 40-50 u long; outer pet 
chaetial leaves like those of the stem, the inner small, pale, mors 
or less deeply cleft into numerous segments, the archegoma 
numerous, with few paraphyses; fruit unknown. (PLATE 18, 
FIGS. 1-6.) ee 
