30 CETRABIA. 



5. C. ramulosa (Hook.) ; thallus tufted, fruticulose, erect, 

 compressed-terete, flstulous, from much-inflated and rather sim- 

 ple or finger-shaped becoming dichotomously branched, and 

 somewhat muricate, especially towards the obtuse tips, with 

 papillseforrn branchlets ; from straw-coloured at length fuscesceut, 

 smooth ; apothecia mostly terminal, smallish to middling-sized, 

 dark chestnut, at length flat, and the crenulate margin erect. 



Spores sub-spherical, ^~ mic. Append, to Parry's 2d Voy.p. 



424. Dactylina, Tuckerm. Obs. Lich. 2, 1. c. p. 397. 



Growing over mosses on alpine rocks. Arctic America, 

 Hooker I. c. 1823. Rocky Mountains, Herb. Hook. Islands of 



Behring's Straits, Wright. The branched condition is well 



-comparable, in habit, with C. aculeata, v. obtusata, Schaer. ( Anzi 

 Lang, n.22; & Rabenh. n. 743.) 



6. C. madreporiformis (Ach.) Mull.; thallus tufted, fruticu- 

 lose, erect, turgid, sub-fistulous, dichotomously short-branched, 

 the branches nodulose, with obtuse tips; straw-coloured, smooth; 

 apothecia lateral, smallish to middling-sized, disk chestnut, mar- 

 gin erect, crenulate. " Spores ellipsoid, -^- mic." Spermatia 



staff-shaped. Mull in Flora, 1870,_p. 32 L Dufourea, Ach.; 



Nyl. Syn. 1, p. 287. Evernia, Fr. L. E. p. 25. Dactylina, 

 Tuckerm. Obs. Lich. I. c. 



On the earth in alpine districts. Rocky Mountains, now fer- 

 tile (Dr. C. C. Parry) Tuckerman Calif., 1866. 



7. C. arctica (Hook.) ; thallus somewhat tufted, turgid, 

 finger-shaped, erect, hollow within, simple or sparingly divided, 

 with tapering, obtuse tips; straw-coloured or now in part fusees- 

 cent, smooth ; apothecia terminal, smallish to middling-sized, 

 disk chestnut, the crenulate margin at length obscure. Spores 

 -sub-spherical, diam. 5-6 mic. Spermatia staff-shaped. Ap- 

 pend, to Frankl. Narr.p. 762. Dactylina, Nyl. Syn. I, p. 286. 



Tuckerm. Obs. Lich. I c. 



On the earth; Arctic America (Richardson), Hooker I. c. 1823. 



The finger-shaped thallus, which developes, in C. ramulosa, 



into a branched one not unlike that of C. aculeata, is persistent 

 here ; and the plant being also larger, is sufficiently remarkable. 

 There can yet be no doubt of the very near affinity of the two 

 lichens ; or that C. madreporiformis is congenerical. 



* * Thallus fruticulose, canaliculate, cartilagineous. 



