MUSCI. (MOSSES.) 59 
squarrose, somewhat Lgulat te from a broad sub lexicaul base, 
crenulate on the margins by the large coset cellules ; costa ‘indistinct, sel. 
dom heath half-way. — Leskea fragilis, Hook. §- Wils. in Drum. Mosses, 2d 
coll. — Hypnum triste, Mull. Synop. Muse. 2. p. 478.) — Very common 
cae ts United States ; on trees, particularly the Hornbeam, Fruit un- 
known. 
66. LESKEA, Se Bryol. Europ. (Tab. 19.) 
Calyptra cuculliform. Opercu conic, acuminate or rostrate. Capsule 
val or cylindrical, pedicellate. Pen double ; the exterior 16 lanceolate- 
eubula teeth ; the interior 16 narrow cilia, as long as the teeth, amsing from a 
te Annulus persistent. ide rescence moncecious or dicecious. 
t a 
branches uniform, ovate-lanceolate, more or less acuminate, mostly costate, 
smooth or papillose, with close subrotund or oval areolation. (Named for NV. G 
Leske, an early German botanist.) 
1. L. polycarpa, Hedw. Moncecious ; stem 2/ long or more, irregularly 
branched; branches ascending, $/-1' high; leaves ovate-lanceolate, a or 
secund, recurved on the margins below, nincgly oo costate to near the apex; cap- 
oa Diao: slightly curved ; iso conic, acute; perichetial leawes 
— Roots of trees, in wet places. (Eu.) 
2. L. obsetira, Hedw. dioknias smaller than No. 1; ramification 
; co 
culum short, conic; cilia of the inner geray perforated. — On trees, wi 
reach of floods: fruits copiously. (Tab. 19.) 
3. L. exile inlet Ww: bf Sch. in sae Moncecious stems sige 
ly eee leaves ov , concave, , spre 
ing, rather lax; cos bk tihng nearly to the point; capsnle oval-oblong. — i 
nervosa, Mi WSC. soe No. 69.) On roots of trees, in wet woods, near Mont- 
gomery, Alabama.— Very near the European L. nervosa, but a more flaccid 
plant, ie leaves more spreading, not so recurved on the margins, nor so attenu- 
ated at the point; the costa extending higher up; capsule not cylindrical ; 
stome smaller and a lored, the interior more imperfect; and mainly 
the inflorescence differen 
4. L. rostra Hedw: WDicecions; branches erect, crowded, fasciculate, 
terete; leaves closely imbricating, ovate-lanceolate, long and slenderly acumi- 
nate, papillose on both surfaces, the margins broadly recurved below ; costa pe 
lucid, sete below the apex; capsule meengeRTe operculum rostrate. — 
in dense and extensive mats, on the base of trees: frequent. (Eu.) 
5. Lt denticulata, Sulliv. Diccious; branches ascending, crowded, 
A small species. 
. 
