NOTES ON MOSSES. 67 
loose yellowish-green patches; stems two to four inches long; 
leaves ovate-lanceolate, with long white denticulate points, rough 
with papilla. 
Fruitstalks about an inch long, with ovate capsules ; lid slender 
and longer than capsule ; calyptra slightly papillose at the apex. 
It is common on rocks and walls in mountainous places. Dis- 
tinguished by its plicate calyptra is Ptychamitrium polyphyllum, 
the many-leaved Fringe Moss. 
The green-tufted Yoke Moss, Zygodon viridissimus, is found on 
trees and sometimes rocks, but seldom in fruit, as is generally the 
case in all species which have dioicous inflorescences ; the fruit is 
of rare occurrence, and is found only where plants of both kinds 
of flowers grow near to each other as Folytrichum commune ; a 
variety, vupestris, is found on rocks near Buxton, but not in fruit. 
Z. Forstert, gathered on trees in the south of England, is very 
rare. Found on sandstone rocks in Cheshire and Yorkshire, and 
known only as a native of Britain and Abyssinia, is Orthodontium 
gracile, the slender Thread Moss. The beautiful and distinct 
Thread Moss, Bryum Tozerz, is one of the rarest of the genus, and 
is also found in Sardinia. 
Among the largest and most elegant of the acrocarpous Mosses 
is the genus Mnium, Thyme Thread Mosses. They are conspicuous 
for their large and broad leaves, and have oval or oblong drooping 
capsules with double peristome of sixteen teeth each. 
Very common in wet shady places by rivulets, springs, &c., and 
varying in size from 3 to 3 inches in height, is JZ. punctatum, the 
dotted Thyme Thread Moss. 
The leaves are roundish obovate, with a thick and opaque entire 
border, nerve ceasing at or near the apex; capsule shortly oval 
and solitary. (Fig. 24.) 
A very much smaller species is MZ. cuspidatum, the pointed 
Thyme Thread Moss, found on shady rocks and walls, especially 
in limestone districts, 
Not infrequent in bogs and marshes, but more slender and 
delicate, although long overlooked as a variety of punctatum, is JZ 
subglobosum, the round-fruited Thyme Thread Moss, and only 
recorded for Yorkshire and Sussex is IZ. orthorhynchum, the short- 
beaked Thyme Thread Moss. 
Growing on heaths, banks and stream sides, and not by any 
means rare, is Extosthodon ericetorum, the narrow-leaved Bladder 
Moss : it is very interesting from the fact that it is considered on 
the authority of Sir J. E. Smith to be the Ayssopus Solomonis. 
“Hyssop on the wall,” of Hasselquist, the learned botanical 
traveller, whose specimens are still preserved in the Linnzan 
herbarium. 
Almost stemless, and with no leaves except those which constitute 
