17. Genus LBUOOBRYUM, Hampe. 
Whole Plant — From 1 to 4 inclies or more in height, in compact, whitish, or glaucous tufts, erect. 
Stems — Varying in length, dichotomously branched, rigid. 
Leaves — Succulent, closely crowded, suberect, lanceolate, from an ovate base, caniculate above ; marginal cells narrow and 
elongated, pale glaucous, yellowish-white, absorbent, somewhat obtuse, with a very faint nerve [too strongly shewn 
in the figure]. ^ 
Infloeescbnce — Monoioous. 
Barren Flowers (Antheeidia) — Gommiform, clustered about 4 together, small. 
Fertile Flowers (Archegonia) — Very long on paraphyses. 
Vaginula — Oblong. 
Capsule — Cernuous, or erect, reddish-brown. 
Calyptra — Pale, cucullate. 
Operculum — Rostrate. 
Peristome — 16 bifid teeth, incurved. 
Annulus — None. 
Spores — Small. 
General Habitat — Boggy heaths and moist woods. Fruit (very rare) : — March. 
Species Illusteated — Leucobryum glaucum (Hampe), Dicranum glaucum (Hedw.). 
Reference to Plate— a, Plant, natural size (barren and fertile plants) ; h, Stem leaf, x 2-in. ; bh, Same, X l-in- ; c. Apex of 
leaf, X 5-in. ; d, Cellules of mid-leaf, X i-in. ; /, Capsule, X 2-in.; //, Portion of capsule, X 1-in. ; g, 
Horizontal section of leaf, X ^-in. 
This genus is represented in Britain by the species figured, which " cannot be confounded with any other British moss " 
(Wilson). 
18. Genus CERATODON, Bn'deL 
Whole Plant — Erect, varying in height from 1 to 2 inches, according to the locality ; perennial, growing on the soil. 
Stems — Caespitose, with innovations, scarcely branched. 
Leaves — 3 to 5 in a row, crowded, concave, lanceolate, pointed, keeled, entire, except at the apex, where they are remotely 
denticular (see fig. c.) ; nerve strong ; areolation dot-like, quadrate, pellucid, and larger at the base, colour dark green. 
Inplokescbnce — Dioicous, terminal. 
Barren Flowers (Antheeidia) | „, , 
Fertile Flowers (ARCHEGomA) ) o^encter. 
Yaginula — Oblong. " * 
Capsule — On a long seta almost erect, cylindrical, furrowed when dry. 
Calyptra — Cucullate, having a long beak. 
Operculum — Conical. 
Peristome — With 16 teeth, deeply cloven, in pairs, lanceolate, united at the base, red. 
Annulus — Deciduous. 
Spores<—Sma,\l. 
Geneeal Habitat — Sandy banks, &c., in moist places. Fruit : — April and May. 
Species Illustrated — Ceratodon purpureas (Bridel), Didymondon purpureus (Hedw.). 
Reference to Plate — a, Plant, natural size; 6, Stem leaf, X 2-in.; c, Apex of leaf, X i-in. ; cc, Base of same, X i-in. ;e, 
Vaginula, X 1-in.; /, Capsule, X 1-in.; //, Teeth of peristome, X i-in.; g, Operculum, X 1-in.; h, 
Annulus, X i-in. ; i, Spores, X i-in. 
This genus is represented in Britain by two species. The species figured is very common in Britain and in all parts 
of the world. The other C. cylindricus, is very local. The teeth of the peristome of this species form a very beautiful 
object for the microscope. 
19. Genus DICRANODONTIUM, Br. & Sch. 
Whole Plant — Perennial, erect, from 1 to 3 inches in height, resembling a Dicranum, crowded in dense patches. 
Stems — Cffispitose, covered with radicles, which are reddish. 
Leaves — Falcate, setaceous, having a dilated base, with a very broad predominant nerve ; areolse narrow ; cells large, 
quadrate, hexagonal at the base, sheathing, dilated. 
Infioeescence — Dioicous. 
Barren Flowers (Antheeidia) / „ , . , 
Fertile Floioers (Aechegonia) ) Gemmiform, terminal. 
Vaginula — Oblong. 
Capsule — Smooth, thin, on an arcuate seta. 
Calyptra — Cucullate, entire, longer than the operculum. 
Operculum — Conical. 
Peristome — Single, teeth 16, linear, lanceolate, striate. 
Annulus — Persistent, narrow. 
Spores — Small. 
General Habitat — Growing on the ground, hilly districts. Rare. Fruit: — October. 
Species Illusteated — Dicranodontium longirostre (Br. & Sch.). 
Reference to Plate — a, Plant, natural size ; aa, Stem leaf, X 1-in.; b, Branch leaf, X 1-in.; bh, Portion of branch and 
leaves, X 2-in.; c, Apex of leaf, X i-in.; cc. Basal cells of same, X i-in.; /, Capsule, X 1-ia.; g, 
Operculum, X 1-in. 
This genus is represented in Britain by the species figured. 
.6 
