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400 Si.Lathag. 3. HOMOTHALAMILE. FLceU.aph. 2. Lathasr'win Jlaccidum. Flaccid lathagriuvi. Thallui leaflike, membranaceous, smooth, blackish green; loles separate, reverse ovate, blmitly divided, not jagged, •weakj flexible: apciheda scattered, few. rather flat, reddish edge thin, not cut. Lichen nisrescens, Ehrh. PL Cr. 10, 9S. Lichen rBpestxii, Scartr yiith. Masc. 31. Lichen flaccirus Ackar. y. A. Stockh, 16, 14. Parmelia tlaccida, Ackar. Metk. lAch. 2s9. Coll ema flaccid um, AcAar. Lick. Uuic. 647. Amongf mosses on rocks exposed to the drip of water. 3. Lathagnumfurcttm. Dusky lathagrium. Thallus leaflike- membranaceous, rather wrinkled, folded, blackish green, granular on both sides : Icles rounded irresul^^i frequently wavey- crisped, not cut: apothecia scattered, flat, blackish brown, edge not cut. Lichen jrannlofcs. FI. Dan. 4G2. Lichen furvas, Ackar. X. A. Stockh. 22, 164. Paraielia forva, Ackar. Metk. Lich. 330. CoUecia gracoloium, Hoffm. FU Germ. 99. Collenja fum m, Ackar. Lich. Vniv. 650. On the bark of old trees, rocks, walls, and wooden roofs. 4. Lathasrium sinuatum. Jagged lathagrium. Thallus leaflike, membranaceous, tiledlikej congregated, naked, black; hies deeply jagged, crisp, toothed: apothecia scattered, sessile, colour of the thallus, edge not cut. Lichenoides tenae crispnsi, foliis parTi: depresjis. Dilkn. Muse. 145. Lichen i.cnatus, Huds. F!. Arts'. . 309 • Engl. Bat. I'i^. Ccllema ^iooatam, Hoffm. FL G^rm. Add. Partnelia scotina sinnaia, Achar. ilztk. Lich. 257. CktUeuia scotinam sinoatam, Ackar. Lich. Unic. 652. Among grass and moss on the groimd. VL 85. LEPTOGIUM. Acharus. Leptogium. Thallus leaflike; lobes rounded, membranaceous, very tender, naked, greyish green, nearly tran^>arent; apothecia on very short pedicells. 1. LeptoPium iremelloides. Tremella leptogium. Thallus leaflike, membrariaceous, very tender, nearly transparent, lead colour, slightly wrinkled and hollow dotted: loles oblong, rounded, cut, smooth-edged: apothecia scattered, with short pediceUs, flat, reddish brown, afterwards black, edge pale.

Pl.cell.aph. y. HOMOTHALAME-E. 85. Leptog. 401 Liclien tremelloide?, Lin. Suppi. PI. 430. Parmelia tremelloides, .dehor, Mtth. Lich. 224. Collemaplicaturo, Hoffm. PL Lich. 2,41. CoUema tremelloides, Achar.Lich. Univ. 655. On trunks of trees and among mosses. 2. Leptogimn marginellum. Edged lepiog'ium, Thallus leaflike, membranaceous, nearly transparent, sliorhtlv wrinkled, sea-o-reen : loles rather long: edsres wavev, pleated, crisp ; apcthecia minute, marginal, iron-brown edge pale. Lichen tnarginellu?, Bern, in Schrad.J. Bot. 1799,21. Partaelia marginella, Achar. Meth. Lich. 225. Collema marginile, Hoffm. PI. Lich. 2,47. CoUema marginelluin, Achar, Lich. Univ. 696, Upon mosses. 3. Leptos'mm lacerum. Torn leptoglum. Thallus leaflike, membranaceous, nearly transparent, loLes small, rather slightly wrinkled in network, sea-green ; tiledlike, irregularly jagged, toothed, fringed ; apolhecia scattered, slightly concave, red, edge pale. Lichenoides sasaiile terne rufercen?. DilUn in Rati Syn. 77, S9. Tremella lichenoides, Lin. S. P. 1625. Lichen trenselloides, Hnds. Fl.Angl. 537. Lichen Tremella, Roth FI. Germ. 503. Lichen iacer, Engl, Bot. 19s2; Achar. Prod. 135. Parmelia laciniata, Achar. Meth. Lich. 225. Collema lacerurc, Achar. Lich. Univ. 657. On the ground among mosses. VII. 86. POLYCHIDIUM. Acharius. Polych'tde. Thallus very finely jagged and branched. 1. Polychid'ium snltile. Fine poly chide. 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 sublilis, Schrad. Spic. 95 : I>icl:s, Cript, 4, 55 ; Engl. Bot, lOOS. 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 tenuisiimum. Thinnest po-ychide, Thallus rather tiledlike: 'agcrs minute, linear, many-cut, unequal, granular, rather pointed, very crowded : apothecia scattered, rather flat, reddish, edged. TOL. I. 2d

400 Si.Lathag. 3. HOMOTHALAMILE. FLceU.aph.<br />

2. Lathasr'win Jlaccidum. Flaccid lathagriuvi.<br />

Thallui leaflike, membranaceous, smooth, blackish green;<br />

loles separate, reverse ovate, blmitly divided, not jagged,<br />

•weakj flexible: apciheda scattered, few. rather flat, reddish<br />

edge thin, not cut.<br />

Lichen nisrescens, Ehrh. PL Cr. 10, 9S.<br />

Lichen rBpestxii, Scartr yiith. Masc. 31.<br />

Lichen flaccirus Ackar. y. A. Stockh, 16, 14.<br />

Parmelia tlaccida, Ackar. Metk. lAch. 2s9.<br />

Coll ema flaccid um, AcAar. Lick. Uuic. 647.<br />

Amongf mosses on rocks exposed to the drip of water.<br />

3. Lathagnumfurcttm.<br />

Dusky lathagrium.<br />

Thallus leaflike- membranaceous, rather wrinkled, folded,<br />

blackish green, granular on both sides : Icles rounded<br />

irresul^^i frequently wavey- crisped, not cut: apothecia<br />

scattered, flat, blackish brown, edge not cut.<br />

Lichen jrannlofcs. FI. Dan. 4G2.<br />

Lichen furvas, Ackar. X. A. Stockh. 22, 164.<br />

Paraielia forva, Ackar. Metk. Lich. 330.<br />

CoUecia gracoloium, Hoffm. FU Germ. 99.<br />

Collenja fum m, Ackar. Lich. Vniv. 650.<br />

On the bark of old trees, rocks, walls, and wooden roofs.<br />

4. Lathasrium sinuatum. Jagged lathagrium.<br />

Thallus leaflike, membranaceous, tiledlikej congregated,<br />

naked, black; hies deeply jagged, crisp, toothed: apothecia<br />

scattered, sessile, colour of the thallus, edge not cut.<br />

Lichenoides tenae crispnsi, foliis parTi: depresjis. Dilkn. Muse. 145.<br />

Lichen i.cnatus, Huds. F!. Arts'. . 309 • Engl. Bat. I'i^.<br />

Ccllema ^iooatam, Hoffm. FL G^rm. Add.<br />

Partnelia scotina sinnaia, Achar. ilztk. Lich. 257.<br />

CktUeuia scotinam sinoatam, Ackar. Lich. Unic. 652.<br />

Among grass and moss on the groimd.<br />

VL 85. LEPTOGIUM. Acharus. Leptogium.<br />

Thallus leaflike; lobes rounded, membranaceous, very<br />

tender, naked, greyish green, nearly tran^>arent; apothecia<br />

on very short pedicells.<br />

1. LeptoPium iremelloides. Tremella leptogium.<br />

Thallus leaflike, membrariaceous, very tender, nearly<br />

transparent, lead colour, slightly wrinkled and hollow dotted:<br />

loles oblong, rounded, cut, smooth-edged: apothecia<br />

scattered, with short pediceUs, flat, reddish brown, afterwards<br />

black, edge pale.

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