32. Genus GEIMMIA, Br. & Sch. 
Whole Plant — Perennial, growing in rounded hoary tufts, or loosely on walls, rooks, and occasionally on trees from ^ inch 
to IJ- inches in height; foliage generally dark green. 
Stem — Dichotomously branched, in some species erect, in others decumbent, with fastigiate innovations. 
Leaves — Spreading, lanceolate, opaque, concave and channelled, when dry spiral, erect, imbricated, firm, having long 
silvery serrated hair points ; margins recurved ; nerve strong, reaching to the apex, vanishing below the silvery 
point ; areolae dot-like, dense in the middle, and upper part, large , and diaphanous at the base. 
Inploebscbnce — Monoicous and dioioous. 
Barren Floiver (Antheeidia) — Both lateral and terminal. 
Fertile Flower (Aechegonia) — Terminal. 
Vaginula — Oblong or conical. 
Capsule — Oval, obovate, elliptical, erect, or drooping, on a short or long seta, curved or upright, colour red to 
reddish-brown, when dry striated. 
Calyptra — Mitriform, lobed, laciniated at the base. 
Operculum — Conical, either long or short, rostrate or oblique, apiculate. 
Peristome — Single, with 16 somewhat large lanceolate trabeculated teeth, red, purple, or- brown. 
Annulus — Either simple or compound. 
Spores — Small, yellow. 
Geneeal Habitat — Rocks, in alpine situations, walls, roofs of buildings, occasionally on trees. Fruit: — March, AprU, 
May, and October. 
Species Illustrated — Grimmia pulvinata (Smith). 
Reference to Plate — a, Plant, natural size; aa, Same, X 2-in. ; h, Branch leaf, X 1-in; hh, Stem leaf, X 2-in. ; c. Teeth of 
peristome, X i-in. ; cc, Same, X 1-in.; d, Cellules of mid-leaf, X i-in- ; e, Basal cells X i-in.; 
/, Capsule, X 2-in.; ff, Calyptra, X 1-in.; g, Operculum, X 1-in.; h, Vaginula, X 1-in.; 
i, Spores, X i-in. 
This genus is represented in Britain by twenty-six species, according to Hobkirk, several species having been dis- 
covered since the publication of " Wilson's Bryologia Britannica." 
33. Genus RACOMITRIUM, Br. & Sch. 
Whole Plant — Perennial, fine tall mosses with terminal fruit, mostly growing on rocks, rarely on soil, from 1 inch to 4 
inches in height, tufted ; foliage light, or dull green, or blackish. 
Stem — Decumbent, from 1 inch to 10 or more in length, dichotomously branched, irregular in some species, leafless at the 
base, slender, fragile. 
Leaves — Spreading, or erect, rigid, lanceolate, slightly secund, recurved, with silvery points similar to Grimmia, which 
many of the species resemble; areote dense, dot-like, small; basal cells elongated. 
Inploeescence — Dioicous. 
Barren Floiver (Antheeidia) — Gemmiform, terminal. 
Fertile Flower (Aechegonia) — With short styles, gemmiform. 
Vaginula — Cylindrical. 
Capsule — Smooth, erect, elliptical, on a straight fruit stalk, narrow at the mouth. 
Calyptra — Mitriform, having a round subulate beak. 
Operculum — Conical, usually upright. 
Peristome — With 16 bi-trifid filiform teeth, in some species very long, reddish. 
Annulus — Large, dehiscent. 
Spores — Small. 
Geneeal Habitat — On exposed moist rocks, and stones in mountainous situations. Pruit : — March and April. 
Species Illustrated — Racomitrium canesoens (Bridel), and R. fasciculare (Bridel), in part. 
Reference to Plate — a, Plant, natural size, R. fasciculare ; hh, Stem leaves, X 2-in.; cc. Apex of Same, X i-in.; dd. Basal 
cells, X i-m. ; e. Teeth of peristome, X i-in. ; ee, Same, X j-in. ; ff, Capsule X 1-in. ; g, Capsule, X 2-in. 
ah, Plant natural size, R. canescens ; 6, Stem leaf, X 2-in. of same; c. Apex of leaf, X i-in. ; d, Basal 
cells, X ?-in.; h, Mid-leaf cellules, X 1-in. 
This genus is represented in Britain by ten species. 
34. Genus GLYPHOMITRIUM, Schwg. 
Whole Plant — Perennial, dwarf, densely tufted, with terminal fruit ; foliage dark green, in the crevices of rocks. 
Stem — Very leafy, scarcely branched . 
Leaves — Lanceolate, spreading, keeled, opaque, firm, crisped when dry, slightly thickened at the margin ; nerve strong, 
reaching to the apex ; areolse dot-like, cellules larger at the base. Perichatial leaves larger. 
iNrLOEESCENCE — Monoicous. 
Barren Floiver (Antheeidia) — Gemmiform. 
Fertile Floiver (AECHE'GONiA)^Terminal. 
Vaginula — 
Capsule — Globose, erect, on a short fruit stalk, reddish-brown, firm, and smooth. 
Calyptra — Large, covering the capsule to the base, plicated. 
Peristome — Single, with 16 plain broad lanceolate red teeth, in pairs. 
Annulus — Indistinct. 
Spores — Large. 
Geneeal''Habitat — Frequently growing near the sea in crevices of rocks in Ireland, Scotland, and Wales. Fruit: — June 
and July. 
Species Illusteated — Glyphomitrium Daviesii (Schwg.). 
Reference to Plate — a. Plant, natural size ; aa, Same, X 2-in.; &, Stem leaf, X 2-in.; hh. Stem leaf, X 1-in.; c. Apex of 
same, X f-in.; e, Calyptra, X 2-in. ; /, Capsule, X 1-in. ; g, Operculum, x 2-in. ; h, Mid-leaf cellules, X 
i-in. ; hh, Basal cellules, X i-in. 
This genus is represented in Britain by the species figured. 
II 
