PI. cell. aph. HOMOTI-IALAMEiE, 85. Leptog. 401 
Lichen tremelloides, Lin. Suppl. PI. 450. 
Parmelia tremeiloides, Achur. Meth. Lick. 224. 
Collema plicatum, Hoffm. PL Lick. 2,41. 
Collema tremeiloides, A char. Lick. Univ. 655. 
On trunks of trees and amona* mosses. 
O 
2. Leptogium marginellum. Edged leptogium . 
Thallus leaflike, membranaceous, nearly transparent, 
slightly wrinkled, sea-green ; lobes rather long; edges wavey, 
pleated, crisp ; apothecia minute, marginal, iron-brown ; 
edge pale. 
Lichen marginellus, Bern, in Schrad.J. Bot. 1799,21. 
Pannelia marginalia, Achur. Meth. Lich. 225. 
Collema marginale, Hoffm . PL Lich. 2,47. 
Collema marginellum, Achar. Lich. Univ. 696. 
Upon mosses. 
3. Leptogium lacerum. Torn leptogium. 
Thallus leaflike, membranaceous, nearly transparent, 
slightly wrinkled in network, sea-green; lobes small, rather 
tiiedlike, irregularly jagged, toothed, fringed ; apothecia 
scattered, slightly concave, red, edge pale. 
Lichenoides saxatile tenne rufescens, Dillen in Raii Syn. 77, 89. 
Tremelia lichenoides, Lin. S. P. 1625. 
Lichen tremeiloides, Huds. FI. Angl. 537, 
Lichen Tremelia, Roth FI. Germ. 503. 
Lichen lacer, Engl. Bot. 1982; Achar. Prod. 135. 
Parmelia laciniata, Achar. Meth. Lich. 225. 
Collema lacerum, Achar. Lich. Univ. 657. 
On the ground among mosses. 
VII. 86. POLYCH IDIOM. Acharius, Poly chide. 
Thallus very finely jagged and branched. 
1 . Polychidium subtile. Fine polychide. 
Thallus slightly starlike, jaggs very narrow, linear, 
pressed close, subdivided, blunt, radiating, edge smooth; 
apothecia central, rather flat, colour of the thallus, edge 
thin, not cut. 
Lichen subtilis, Schrad. Spic. 95 ; Diclcs. Crypt. 4, 25 ; Engl. Bot. 1008. 
Parmelia subtilis, Achar. Meth. Lich. 243. 
Collema subtile, Achar. Lich. Univ. 659. 
On clay and limestone. 
Scarcely visible to the naked eye, but grows in patches. 
2. Polychidium tenuis. simum. Thinnest polychide. 
Thallus rather tiiedlike ; jaggs minute, linear, many-cut, 
unequal, granular, rather pointed, very crowded ; apothecia 
scattered, rather flat, reddish, edged. 
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