231 LICHENES. [Cladon 



j$. Thallus (or podetium ?) Jlstulose. Apothecia hemispherical 

 fleshy (cephalodia). 



FAM. XVII. CLADONIEiE. 



(Part of, Hoffm. — Cenomyce, part of, Ach.) 



37. Cladonia. Fee. Cladonia. 



Thallus (podetium, Ach.) somewhat shrubby, branched, rarely 

 simple, leafy with scales, which are often evanescent, branches 

 cartilaginous rigid fistulose, all attenuated and subulate, divided, 

 fertile, generally perforated in the axils. Apothecia (cephalodia) 

 sessile, orbicular, convex, capituliform, not bordered, fixed by 

 the circumference, free beneath in the centre, the sides reflexed, 

 uniform within. (Fee.) — Name; xXaSoj, a branch; the rami- 

 fications being often copious I have followed M. Fee in dis- 

 tinguishing those species of Cladonia (or Cenomyce, Ach.) which 

 have subulate branches, from those whose apices are cup-shaped, 

 but I am by no means sure that the characters are to be 

 depended upon. The determination of the species, both of 

 this and the following genus, are attended with the greatest 

 difficulty, on account of their variable character ; and in the 

 present state of my knowledge I dare not venture upon intro- 

 ducing others than those published in English Botany. Much at- 

 tention has been given to this genus by Delise in the Botanicon 

 Gallicum, who, with Acharius, unites this and the two following 

 genera into one, Cenomyce, and enumerates 53 species, besides 

 many marked varieties, as natives of France ; all of which are 

 most probably natives also of Britain. He would render an 

 acceptable service to British Botany who should undertake a 

 monograph of the British Cladoniece. 



1. C. vermicularis, De Cand. (Vermicelli Cladonia); podetia 

 spreading horizontally pure white subulate simple or slightly 

 branched, branches tapering at each end. Schcer. Lich. Helv. 

 Spicil. p. A4:., Lich. Exsicc, n. 128. — Cenomyce vermicularis, 

 Ach. Syn. p. 278. — Lichen vermicularis, Swartz. — Dicks. Cr. 

 Fasc. 2. p. 23. t. 6.f. 10. E. Bot. t 2029. 



Not unfrequent on bare ground, on the lofty mountains of the North 

 of England and Scotland. — This has a very remarkable appearance and 

 is quite different from all the other species of the Genus, lying prostrate 

 on the ground and of a pure white colour, smooth, and the surface 

 resembling, from the shape of its branches, small worms. The fruc- 

 tification is unknown. 



2. C. uncidlis, (short perforated Cladonia); podetia elongated 

 smooth cylindrical pale yellowish-white dichotomous the axils 

 much perforated, the branchlets short patent at the extremity 

 acute and rigid. — Cenomyce uncialis, Ach. Syn. p. 276. — Lichen 



