CETRARIA, 33 



the published specimen of Dickson ! which is cited by the 

 former, is certainly the same plant : as are those of Floerke 

 (herb.) Fries, Schserer, and Mougeot & Nestler (739). But it is 

 scarcely to be questioned that &, known only as American, is the 

 true type of the species. 



13. C. Fendleri (Tuckerm.); thallus dwarfish, membrana- 

 ceous, foliaceous, many-cleft, smooth ; from pale- at length 

 brownish-olivaceous; beneath whitish, reticulately wrinkled, and 

 beset with scattered, coarse, pale fibrils ; lobes-substellate, linear, 

 flat, denticulate, now at length crowded and complicate ; apo- 

 thecia (frequent, and now crowded) smallish to middling, 

 marginal ; chestnut ; shining ; with a crenulate margin. Spores 

 rounded and ellipsoid, -~^ mic. Spermatia as in the last, but 



longer ; as in the two next. Cetraria, Tuckerm. Gen, p. 280. 



Parmelia, Ejusd. inNyl. Enum. Gen. p. 105, & Lich. Calif, p. 14. 

 Plalysma, Nyl. Syn. p. 309. 



Trees, and dead wood. On pines, New Mexico (Fendler), 

 Tuckerman inNyl. I.e. 1858. Colorado, Brandegee, comm. Sprague. 

 Pines, South Carolina, Ravenel. Alabama, Peters. Pines, and 

 rails, Maryland, Tuckerman; New Jersey, E. Michener. Rails, 

 Rhode Island, J". L. Bennett. The rail specimens more com- 

 pact and complicated, exactly as in the preceding species, C. 

 ciliaris, etc. Spermogoues marginal in the tree-form ; and not 

 in fact varying from this more than we find to occur in some 

 other Cetrarics. The under side of the thallus agrees closely 

 with that of C. aurescens. 



14. C. Falilunensis (L.) Schser. ; thallus sub-cartilagineous, 

 foliaceous, many-cleft, smooth ; from olivaceous-brown soon black- 

 ening; beneath blackening, wrinkled, with scattered fibrils of the 

 same colour ; lobes sinuatelylobulate, more or less channelled; apo- 

 thecia marginal, middling-sized to ample, externally granulated, 

 at length dilated; disk chestnut; margin rugose -crenulate. 



Spores short-ellipsoid, 31 _ 6 mic. ScJicer. Spicil. p. 255. Par- 



melia, Ach. L. U. p. 470. 5 Fr. L. E. p. 66. Platysma, Nyl. Syn. 

 1,^.309. 



Alpine rocks; and descending, in mountainous districts. 

 Arctic America (Richardson], Hooker I. c. 1823; Vahl. New- 

 foundland, Despreaux. Hastings county, Canada, Macoun. 



Higher mountains of New England, Tuckerman. A state with 



3 



