200 THE MICROSCOPICAL NEWS. 
O. rivulare, the river Bristle Moss, is found fruiting in April and 
May on rocks and tree trunks at the edges of streams, the stems 
often floating in the water; leaves oblong-ovate ; obtuse, with a 
strong nerve and small papille ; capsules pear-shaped and widely 
striated, calyptra naked ; teeth in eight pairs with sixteen cilia. 
O. Sprucet, found on trees near rivers in May and June, is a 
minute Moss with tufted stems only 1 in. long. 
O. diaphanum, the white-tipped Bristle Moss, fruits in April on 
walls, trees and palings, and is very distinct from all the other 
species by the character of its leaves which are spreading ; ovate- 
lanceolate, tapering to a slender diaphanous serrulate point, margin 
recurved ; capsules almost immersed, faintly striate; calyptra 
naked ; teeth sixteen with sixteen cilia. 
Two species fruiting in May, and found on the trunks of trees, 
are O. letocarpum, the smooth-fruited Bristle Moss, with stems one 
to three inches, and O. pulchellum, the elegant and minute Bristle 
Moss; stems only ¥ in. in height. A delicate species found on 
trees, fruiting in May and June, but not common, is Uofa crispula, 
the dwarf-curled Bristle Moss. 
Zygodon conoideus, the lesser Yoke Moss, is found on trees in 
several parts of England, but seldom in fruit; while Z. Wowed/iz, 
found on walls, is very rare. 
A very elegant little Moss, and a very common one on decaying 
trunks of trees and on the ground in hilly districts, is Zétraphis 
pellucida ; the name pellucid being well applied, as no character 
is more marked than the delicate transparency of its pale, some- 
what rigid, and neatly arranged foliage. 
The fruit is rather rare, but we always find on the summit of 
some of the branches little cup-shaped receptacles, formed of 
broadly obcordate leaves, containing little spherical bodies (gemme), 
attached by a footstalk. The stems are elongated with ovate, 
acuminaté leaves. The capsule of this and the next species has 
four only, erect, cellular teeth, from which the name was given by 
Hedwig; but Ehrhart named it Georgia, in honour of King 
George III., whom he describes as “an eminent patron of botanical 
study ;” and this name has been adopted by Dr. Braithwaite in 
his Moss-Flora. Muller, in his synopsis, also retains the original 
name Georgia. 
Tetradontium Brownianum, first discovered by the late R. 
Brown, Esq., at Rosslyn, is by no means common, and is found on 
rocks, generally of sandstone, growing chiefly on such as have 
their surfaces looking downwards. 
A very peculiar and rare genus is Buxbaumia, named after a 
German botanist. The spores only escaping by the upper half of 
the capsule separating at a lateral seam, like a bivalve fruit. 
B. aphylla, the leafless Buxbaumia, is without stem ; the vaginula 
