146 LICHENACEI. [ CLADONIA. 



18. C. degenerans Florke, Clad. (1828) p. 41. -Thallus squa- 

 mulose at the base ; squamules few, small, crenato-incised, glaucous- 

 green above, white beneath ; podetia moderate, glabrous, often sub- 

 verrucoso-unequal, scyphiferous, whitish or pale-greenish, black and 

 whitish-punctate at the base ; scyphi often radiato-pedicellate or 

 proliferous at the margins (K , CaCl ). Apothecia somewhat 

 large, brown, or pale reddish -brown ; spores 0,010-11 mm. long, 

 0,0035 mm. thick. Cromb. Lich. Brit. p. 19 ; Leight, Lich. Fl. 

 p. 64, ed. 3, p. 59. Cladonia degenerans b. euphorea Mudd, Brit. 

 Clad. p. 17. Cladonia graciUs f. degenerans Mudd, Man. p. 55. 

 Capitularia degenerans Florke in Web. et Mohr, Beitr. ii. (1810) 

 p. 308. 



A very variable plant, which approaches in its varieties and forms 

 several other species. In general it may readily be distinguished from all 

 of these, with which it might be confounded, by having the podetia, 

 which in age become blackish in their lower portion, whitish corticali- 

 punctate at the base. Its most typical state, as observed by Nylander 

 (Lich. Scand. p. 54), is form euphorea Ach. (Syn. p. 259), which has 

 almost the habit of C. yracilis and presents the above characters. The 

 only British specimen as yet seen is sterile. 



Hob. On the ground in moorlands in subalpine mountainous regior.s. 

 Distr. Found only very sparingly among the N. Grampians, Scotland. 

 B. M. : Head of Glen Gairn, Braemar, Aberdeenshire. 



Form 1. haplotea Florke, Clad. (1828) p. 42. Podetia moderate, 

 usually proliferously divided above, scyphiferous, scarcely or rarely 

 squamuiose ; scyphi cristate-divided at the margins. Mudd, Brit. 

 Clad. p. 18 ; Cromb. Lich. Brit. p. 19. Cladonia gracilis $. de.qe- 

 nerans a. haplotea Mudd, Man. p. 55. Cenomyce gonorega a. aplotea 

 Ach. Syn. (1814) p. 258. 



The podetia in this form are from 1 to 2 in. high, naked, or occa- 

 sionally, especially at the margins of the scyphi, sparingly squamuiose. 

 In the few British specimens, the apothecia, which are minute, reddish- 

 brown, are only sparingly present. 



Hob. On the ground in subalpine and alpine regions. Distr. Appa- 

 rently local and scarce among the Scottish Grampians. B. M. : Pass of 

 Leny, Perthshire ; Ben-naboord and Upper Glen Dee, Braemar, Aber- 

 deenshire. 



Form 2. granulifera Cromb. Grevillea, xi. (1883) p. 113. 

 Podeiia moderate, densely verrucoso-granulose, simple, or shortly 

 branched above, obscurely scyphiferous. 



Seems to be intermediate between the type and the following variety, 

 and is well characterized by the minute crowded granules with which 

 the blackish podetia are clothed throughout. The apothecia in the only 

 specimen seen are somewhat large and dark-brown, but are visible only 

 on a single podetium. 



Hub. On the ground in alpine situations. Distr. Met with only once 

 and very sparingly among the N. Scottish Grampians. B. M. : Cairn- 

 gorm, Braemar, Aberdeenshire. 



