270 EXPLANATION OF THE PLATES. 
Fig. 16. Hypnum. cupressiforme. Musci. Peristome 
split, laid open, and magnified, to show the fringe and 
teeth.—Peristome double; teeth 16, lanceolate; ciliz 16, 
opposite, membranaceous, united at bottom; bristles 16, 
interposed. 
Fig.17. Sphagnum palustre. Musc:. Part of the plant 
magnified; surcule branched, leaves oval, blunt, concave, 
tiled-like; pedicell short; urn ovoid, upon a disk-like 
apophysis; peristome 0. 
a. Urn, the calyptra and operculum being taken off. 
b. Orifice naked. 
c. Apophysis. 
Fig.18. Gymnostomum pyriforme. Musci.. Germination 
of its seminule, as observed by Hedwig, very much mag- 
nified; showing the seminule throwing out a radicle, and 
a succulent thread, considered as a cotyledon, which ap- 
pears to be jointed, and having nipples which elongate into 
branches. | 
Fig.19. Variolaria tumida. Lichenes. Entire plant mag- 
nified. 
a. Thallus thin, crustlike, growing upon trees. 
b. Patellules whitish, convex at first, slightly concave 
afterwards. 
Fig.20. Patellaria ocellata. Lichenes. Entire plant mag- 
nified. 
a. Thallus adherent to stones, solid, crustlike, wrinkled, 
areolated, greyish white. 
l. Scutelles black, concave; edge elevated, of the colour 
of the thallus. 
Fig. 21. Isidium corallinum. Lichenes. Entire plant 
magnified. 
a. Thallus. . 
b. Podetia solid, cylindrical, branched, crowded, whitish. 
c. Terminal globules. 
Fig. 22. Tips of the podetia of the same. 
a. A globule still adhering to the podetia. 
). Pitt remaining after the globules have fallen off. 
Fig. 23. Cenomyce pyxidata. Lichenes. Entire plant. 
a. Podetium proliferous, fistular, funnelshape at top. 
Lb. Podetia growing on the edge of the iower podetium. 
c. Cephalodium thick, irregular, sinuous, brown. 
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