212 LICHENES. [Collema* 



furvwn, Ach. Syn. p. 323 Lichen furvus, Ach. in Nov. Act. 



Holm. v. 22. p. 164. t. 10./. 2.— Dill. Muse. t. 19./. 24? 



On the ground, Sussex, Kirkby Lonsdale, &c. Gravel walks, Oxford? 

 Dillenius.—" Distinguished from the following by its larger lobes, more 

 pulpy when wet and sprinkled on both surfaces with granules which do 

 not become leafy, and by the smaller almost stalked scutellcB with an 

 entire elevated border." Borr. 



24. C. crispum, Borr. (curled Collema); lobes of the thallus 

 thinnish much divided their segments imbricated crowded 

 rounded concave with entire or denticulate raised edges, apo- 

 thecia sessile the border crenulate at length leafy. — Borr. in 



E. Bot. Suppl. t. 2716./. 1 Lichen crispus, Linn.— Dill. Muse. 



t. 19./. 23. 



Not uncommon on stones and walls, sometimes on the ground- — 

 " This Lichen only is preserved in the Dillenian Herb., as the plant fig. 

 in the Hist. Muse. ,- it must therefore be regarded as the L. crispus of 

 Huds. and Linn., and ought to retain the name. It is possible that C. 

 crispum, a. Ach. Syn. p. 311, may belong to this species : but it is more 

 probable that it stood better, with all the vars., where he had placed it 

 in the Lich. Univ., under C. pulposum (L. pulposus, Bernh.), which is 

 the L. crispus, E. Bot. t. 834. The latter is excellently described by 

 Wulfen, (in Jacquin's Collect, v. 3. p. 139. t. 12. f. 1.) as the L. crista- 

 tus, Linn., a species adopted, as L- crisjms was, from Huds. and Dill. 

 In this instance, the Dillenian Herbarium fails us ; for under the No. 

 (t. 19./. 26) to which Hudson refers as his L. cristatus, are preserved 

 one specimen of the larger var. of C. pulposum, Ach. (usually regarded 

 as L. cristatus), others of the plant now before us, and one or two of 

 our C. ceranoides. The figs, and descr. in the Hist. Muse, do not decide 

 the question. We have not examined the specimens in the Herbaria 

 of Sherard and Buddie. At present, therefore, we would call the 

 species cristatum instead of pulposum ; since it cannot be doubted that 

 the larger var. at least, which grows on the ground and has more erect 

 and more laciniated lobes, was contemplated by Hudson and the places 

 of growth which he mentions, lead to the presumption that he included 

 the smaller and more common form also. From all the states of that 

 very variable Lichen, our C. crispum is readily and satisfactorily distin- 

 guished by its thinner and more leaf-like lobes." Be 



>orr< 



25. C. derma tinum, Ach. (shinny Collema); lobes of the thal- 

 lus between gelatinous and coriaceous rounded with ascending 

 sinuated edges, upper surface sprinkled with granules, apothe- 

 cia somewhat stalked, the border narrow entire slightly raised. 

 —Ach. Lich. Univ. p. 648, Syn. p. 322 — Dill. Muse. t. 19. 

 f. 22. 



On calcareous rocks ; in fruit, N. Wales, Mr. Griffith : barren, in 

 Leigh Wood near Bristol, Mr. Forster.—" Thallus about as thick as in 

 C. crispum, its lobes larger and less divided ; apothecia much like those 

 of C. granulatum, E. Bot. t. 1757 and C. flaccidum, t. 1653; but the 

 thallus is much less thin and membranous than in the latter, the lobes 

 less entire and the granules not so numerous nor so minute ; while the 

 lobes are less concave than in C. granulatum and the granules are con- 

 fined to the upper surface, and the tufted cottony radicles are wanting. 

 Judging from the specimen sent by Acharius to the Linn. Society, the 

 C. thysanceum of that author is but a var. of C. dermatinum." Borr. 



