The English flora - SeaweedAfrica

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Collema.] I.ICHENES. 207
following species have a remarkably fetid smell, which has been compared
to that of the urine of mice.
8. S. sylvdtica, Ach. (jtitted wood Stictci); thallus spreading
of a greenish-rusty hue (brown and glossy when dry) somewhat
pitted and often rough with grey scattered granulations,
deeply divided into lohed and sinuated rather ascending segments,
beneath tawny-brown downy and fibrous with pale naked
cyphellse, apothecia " on marginal segments vertical convex
dark-brown." Ach. Syn. p. 236. Lichen sylvatieus, Huds.—
E. Bot. t. 2298. Jacq. Coll. v. 4. t. 12. f. 2.—Pdtigera sylv.,
Hoffm. PI. Lick. v. 1. /. 4./. 2.—Dill. Muse. t. 27. f. 101.
Shady woods, about the roots of trees in mountainous countries : frequent
in Scotland.—The fructification is unknown to me, except from
the figures of Jacquin and Hoffman ; but Sir Jas. E. Smith confirms
the correctness of these by the recollection of a fine specimen in that state
sent by Dr. Burgess to Dr. Hope. The apothecia are terminal, on peculiar
segments of the frond and are very similar to those of a Peltidea,
to which genus (his Peltigera) Hoffmann indeed referred it ; but from
which it is distinguished by the presence of cyphellce the underside of the
frond.
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** Thallus, in a moist state, of a gelatinous substance.
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FAM. X. COLLEMATEiE.
20. Colle3IA. Ach. Collema.
Thallus entirely of one substance, gelatinous, when dry generally
becoming liard and cartilaginous, polymorphous, granulated,
foliaceous, lobed, laciniated or branched. Apothecia (sct/tellcc)
orbicular, sessile (rarely stipitate), bordered, entirely formed of
the substance of the thallus, the disk sometimes coloured
Named from y.o?.Xa, gluten ; on account of the gelatinous nature
of the whole plant.— In drying, these plants are necessarily much
altered in form, and from this and their variable character there
i«- considerable difficulty in the determination of the Bpecies.
* Thallus somewhat crustaceans, uniform.
1. C. nigrum, Ach, {inky Collema); crust of a sooty-black
composed of very minute imbricated lobed and cut leaflets the
margin bluish, apothecia scattered small black at first bordered
and concave at length convex. Adt. Syfl,p. 306.— Lulu n ///