: 
NEW BRITISH MOSSES. 185 
Plants forming very small, compact tufts. Stems short 
(3 or 4 lines in length), each bearing a capsule, simple or 
once dichotomous. Leaves imbricated, suberect (appressed 
when dry), ovato-lanceolate, much broader than in O. affine: 
sub-obtuse, sometimes apiculate, concave, often subplicate, 
navicular at the apex, the areolation slightly wider than in 
O. affine. Vaginula and calyptra smooth, the latter greyish. 
Capsule emersed, pale-coloured when just mature, elongato- 
pyriform, with a long neck tapering into the pedicel (which à 
little exceeds the vaginula), the outer paries rather widely 
areolated, and niarked with 8 broad strive.  Peristome of 
8 bigeminate teeth, arched into à hemisphere when moist, 
though slightly turned up at the apices; when dry reflexed, 
rarely separate: Cilia 16, the alternate ones usually not more 
than half the length of the others, yet sometimes equalling 
them, filiform, composed ofa single series of cellules. Oper- 
culum convex, shortly rostrate. 
O. pallens is difficult to separate from O: tenellum by the 
eye; the best field-characters are afforded by the subcylin- 
drical capsule of the latter, the collum not tapering into the 
pedicel, and the mach larger, strdw-coloured and slightly pilose 
calyptra, 
14. Orthotrichum pumilum, Schwaegr., “ monoicum, pulvi- 
natum, humile; caule dichotome ramoso, dense folioso; 
foliis patulis, siccitate imbricatis, lanceolatis, obtusiusculis, 
Costato-concavis; capsula ovata, brevicolla, late striata; - 
calyptra campanulata, nuda.” Bryol. Eur. on 
. “O. pumilum, Schwaegr. Suppl. 1, P. 22, T. 505 Kaulfuss 
n Sturm Deutschl. flor. crypt., Heft. 165 Brid. Bryol. univ. 
1, 256; Web: et Mohr. bot. T: 232; O. affine, B. pumilum, 
Hook, et Tayl. Musc. Brit. p. 74. 
en On an ash-tree in Clifton Ings, near York; April, 
43. i 
This is very distinct from O. affine (of which it is made a 
| € in Muse. Brit.) by the following characters. Leaves 
Shorter and wider, the upper slightly apiculate, not recurved 
E ‘Mtoe of Où affine most commonly aré, the margins strongly 
zi tdopccened eos 
VOL. fv. 
