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 micro- 

 phyifo 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 thick- 

 edged crenate smooth, apothecia tawny with a thick olive bor- 

 der. 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 olive- 

 black 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. \.f. 1. u Collema pidposum, Ach. Syn.p. 311. 



On the ground, among rocks and on mosses, in various places. — I 

 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. 



