Collema.] LICHENES. 209 



Borrer. — " The near affinity of this little Lie/ten with the L. crispus of 

 E. Bot. is obvious, and it may possibly be but a variety ; yet the scat- 

 tered mode of growth and the less tenacious substance of the thallus 

 which almost disappears in drying, seem to indicate a specific difference." 

 Borr. 



7. C. turgidum. Ach. (turgid Collema); thallus irregularly 

 spreading- depressed slightly lobed and snbimbricated, the lobes 

 elevated thick verruciform rugged granulated, apothecia sessile 

 urceolate dull-brown, the border somewhat inflexed and tumid 

 externally rough with granulations. Ach. Syn. p. 313. 



On stones, among mosses, England (Ach.). — Acharius appears to have 

 received this plant from England, but he has not stated upon whose 

 authority it is a native, and I am totally unacquainted with the species. 



8. C. tenax, Ach.? (tenacious Collema); thallus rather glau- 

 cous fleshy imbricated the lobes obtuse somewhat palmate, apo- 

 thecia depressed dilated reddish. Ach. Syn. p. 314. — Lichen 

 tenax, E. Bot. t. 2349. (not Sivartz, nor Bernhardi.) 



Alpine-situations, among mosses, N T . Wales, Rev. II. Davies. — See re- 

 marks under the next species. 



9. C. ceranoides, Borr. (horned Collema) ; lobes of the thallus 

 imbricated ascending pulpy dilated upwards proliferous termin- 

 ated with crowded erect elongated granules overtopping the 

 flattish apothecia. Borr. in E. Bot. Suppl. t. 2704./. 2. — 

 Collema pal mat urn, «. Ach. Syn. p. 319? 



On chalky soil of the Sussex Downs, Mr. Borrer. Box-Grove, near 

 Chichester, Mr. R. J. T. Thomas, Hexham, Essex, Mr. K. For.ster.—^ 

 " C. ceranoides is nearly allied to C. cristatum, with the larger van. of 

 which it is, in all probability, often confounded ; but it is distinguishable 

 by the clustered fastigiate granules, or ramuli, which compose its sur- 

 face. Acharius seems to have taken it for Lichen palmatui of Hud*. : 

 but, whatever this one plant may have been, that figured by Dill. t. 10. 

 /. 30, is proved, by the specimen preserved in his herbarium, to be the 

 L. pidmatut of E. Hot. (. 1635, with which the description in the Hist. 

 Muse, likewise accords. To this the /3. of Ach. ((.'. cornictdatum 

 Iloff'w.), probably belongs. It is possible that the species before us 

 may be the /,. tenax. /','. Bot. /. 8349, the original specimen ofwhich 

 has been sought in vain in the Smithian collection. We haT6 seen 

 neither authentic specimens of the L. tetUM of Swartz, nor Acharius 1 

 figure in the Stockholm Transactions, but the L. tenax o\' Bernfaardfs 



paper in S ( hrader's Journ., w Inch is regarded as the same with Swart/'-, 



must necessarily, from the figure, be a different Lichen from ours." Borr. 



10. C. pliedtiie, Ach. {/>/<//t<<! Collema); thallus orbicular 



imbricated all the lobes thick rounded plaited ascending entire, 



apothecia reddish-brown concave crowded. — Ach* Syn. p. 91 i. 

 /•:. Bot. t. 2348. -Lick, plicatilh, Ach. mi Act. Holm, r. hi. 



p. II. t. [./* 2* 



On wet Of inundated rocks, in alpine situations. 



11. C.jhtvidtile, Ach. ( River Colli ,,„i >,- thallus thick imbri- 

 cated greenish-black, it-> segments obovate or linear < onj ex pro- 

 liferous channelled beneath, apothecia globoM OOncaYC brown. 



P 



