248 THE JOURNAL OF BOTANY 
have never met with an intermediate form. I propose serie 
to ponenee? at — as a new species of Weisia, under 
of W 
Weisia sterilis, sp. nov. Monoicous. Male flowers gemmi- 
form ada ap the pericheetium. Tufts larger and much looser than 
those of W. crispa, often very loosely adhering to the substratum, 
yaltowial green. Stems branched, rarely simple, to 2°3 cm. high. 
Leaves small in the lower parts of the stem, increasing in size 
towards the apex, me they are often 8 mm. long, rather narrow, 
from about *65 mm. b Fax ve the base to ‘25 in the middle of 
the leaf; margin 3 fiat, or rarely very slightly incurved, strongly 
ei when dry. Cells pelle roundish quadrate, above ‘008 to 
‘010 mm. wide, less papillose than in W. crispa, incrassate, basal 
cells "honieWhit elongate. Nerve stout, about -09 at the base, 
ea 38 smooth at the back, excurrent in a short point. Peri- 
chetial mm., and except in the sheathing hyaline 
base, composed of thinner-walled cells, not very different from the 
ordinary leaves. Seta about °45 apsule nearly 
2 ae abou mm catia with the operculum, which is a 
pei snpetl by Tostangulé: and about -045 broad in the mi 
of the co al “Spo ores ‘016 to 018 mm., pale brown, papillose ; 
mature in Fe 
On pol atitey slopes and stony broken ground on the chalk 
downs from Lewes to pags ster (W. E. N.), Reigate (W. E. N.); 
Folkestone (H. N. Dixo 
W. —— differs rail W. Levieri (Limpr.) Kind., to which Dr. 
at first inclined to refer it, in the narrower yellowish 
. with pellucid soli and the less highly developed os 
. erispa var. aciculata (Mitt.) Braithw. in the more 
sjumetona narrower rahi which are ey arto nba the ‘ 
lof 
