The English flora - SeaweedAfrica

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203 LICHENES. [Collema.
sessile with a raised entire border at length flat.—Ach. Lich.
Univ. p. 630. Syn. p. 310.
On Elm bark, near Bury, Suffolk, Rev. G. R. Leaikes , and sent by
Mr D Turner to Acharius, who has also received it from Sweden,
France and Switzerland.—" The crust of this Collema is considerably
like the supposed thallus of the very anomalous Lichen spongiosis, E,
Rot t. 1374. It has not the fibrous black substratum of Leculea microphyifo
t 2128, to which Acharius compares it, and to some states of
which,' it has, in other respects, much resemblance. The species is more
likely to be confounded with C.fragrans, E. Rot. L 19 12, but the thallus
of that lichen is less imbricated, with larger less divided lobes, the edges
of which are less notched or crenated, and somewhat raised, and the
surface has not the powdered or granulated appearance when dry.
Rorr.
3. C. cheileum, Ach. (lipped Collema); thallus suborbieular
imbricated lobes thick all minute rounded crenulated ascending,
apothecia nearly plane aggregated of the same colour as the
thallus, the border crenulated subevanescent. Ach. Syn. p. 310.
Hook. Fl. Scot. P. II. t. 71.—Lichen marginalus, Bernh. in
Schrad.Journ. 1799, 1. p. 6. t. l.f.2. u. Dicks.Cr. Fasc. A. p. 25.
Roots of trees, in shady subalpine woods, Scotland, Mr. Dickson.
4. C.frdgrans, Ach. (fragrant Collema); thallus suborbicu-
lar olive-black its lobes ascending crowded rounded thickedged
crenate smooth, apothecia tawny with a thick olive border.
Sm.—Ach. Syn. p. 311.,—Lichen fragrans, E. Bot. t. 1912.
On trunks of Elm and Ash in Kent, Surrey and Sussex, Mr. Rorrer.—
This plant "is remarkable when moistened for its very sweet aromatic
scent, not unlike the spiritus volatilis aromatieus of the apothecaries,
though of course much fainter," (Sm.) ; but Mr. Borrer observes that
this was probably accidental, for he finds no odour except what is often
perceptible in other pulpy Collemata, especially in specimens that have
been dried and subsequently moistened.
5. C. cristdtum, Ach. (crested Collema); thallus thick oliveblack
suborbieular very compact cut into numerous plaited
notched nearly erect lobes those of the circumference depressed
larger crenulated obtuse, apothecia scattered red-brown slightly
concave with an elevated irregular border. Lichen cristatus,
Huds.—Linn.—Jacq. Coll. v. 3. p. 139. t. 12. f. l.—L. crispus,
E. Bot. t. 834. L. pnlposus, Bernh. in Schrad. Journ. Bot.
1799, l.p.l.t. 1.
\.f. u Collema pidposum, Ach. Syn.p. 311.
On the ground, among rocks and on mosses, in various places.—
have taken advantage, in adducing the synonyms of this plant, of Mr.
Borrer's remarks given here under C. crispum, our No. 24.
6. C. limosum, Ach. (mud Collema); lobes of the thallus
scattered appressed thick and pulpy flattish slightly crenulate
almost evanescent in drying, apothecia immersed the border at
leno-th somewhat prominent nearly entire. Borr.—Ach. Syn.
p. 309. Borr. in E. Bot. Suppl. t. 21§±.f. I.—Lichen limosus,
Ach. Prodr. (excl. syn. Hoffm.)
Perhaps common on wet clayey soils ; Hurst-pierpoint, Sussex, Mr.
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