426 FLORA OF OXFORDSHIRE. 
R. rusciforme, Dill. 
Hypnum ruscifolium, Bryol. Brit. 
Stones in or by water. November, December. River Windrush ; 
Canal banks; Iffley; etc., frequent; fine at Bayswater Mill, attaining 
a great size and fruiting copiously. 
PLAGIOTHECIUM, Schpr. 
P. denticulatum, L. (Hypnum.) 
Sides of woods, copses, hedge-banks. June, July. Frequent, but apt 
to be overlooked till winter has cleared away the foliage from the bushes, 
when its numerous old capsules become conspicuous. The foliage varies 
in brightness, and some states are difficult to distinguish from the following 
species. 
P. sylvaticum, L. 
Woods at roots of trees, etc., rare. Autumn. Singe Wood near Witney ; 
1882. Unless I have overlooked it this is very rare with us. 
P. undulatum, L. 
Open woods, copses, sandy heaths. April. Near Nettlebed; Buckland, 
Berks. Much larger and more conspicuous than the two foregoing, and 
apparently very rare in these counties. 
AMBLYSTEGIUM, Schpr. 
A. serpens, Linn. 
Trees, walls, banks, common. April. Though small generally con- 
spicuous by its numerous capsules. 
A. radicale, Beauv. 
Wet and shady places, rare. April. Shotover, on dead sticks by the 
ponds, scarce. 
A. irriguum, Wils. 
Stones near water, rare. April. Near Sandford Lasher, 1861. A few 
small patches only. 
A. riparium, Linn. 
Stones, trees, and old timber by water, etc. April. Frequent, and 
varying much; a large Fontinalis-like form occurs in wet grassy spots, 
which seems never to produce fruit. 
HYPNUM, Dill., Linn. 
H. Sommerfelti, Myrin. 
HT. polymorphum, Wils. 
Walls, etc. in limestone districts, rare. May. Asthalleigh, in company 
with serpens and molluscum, Anom. viticulosus, ete., 1869, 1871. 
