264 



POPULAE HISTORY OP LICHENS. 



1. B^eomyces nosEUS (roseus, rose-coloured). Thallus 

 white, leprose-tartareous, verrucose. Stipes terete, somewhat 

 short, of similar colour to thallus. Apothecia rose- or flesh- 

 coloured."* 



Not uncommon on argillaceous soils on hill-heaths. The 

 thallus sometimes becomes isidioid, — the stipes sterile, and 

 ventricose at the apex. Its thecse are long, linear, and 

 slender ; its spores fusiform, elongated, simple, and pale 

 yellow. 



Genus III. CLADONIA, Hill. 



Gen. Char. Thallus microphylline, sending up vertical, hollow 

 stalks (podetia), some of them turbinate or tubaeform, and termi- 

 nating in a funnel or cup-shaped dilatation (scyplius) ; others cylin- 

 drical, simple or ramose, the extremities subulate or bearing the 

 apothecia. Apothecia orbicular, submarginate ; becoming at 

 length inflated, cephaloid, immarginate ; empty, seated normally 

 on the margins of the scyphi or on the extremities of the cylin- 

 drical podetia. Proper exciple minute, ventricose, becoming con- 

 cealed by the protuberant, reflexed thalamium.f 



One of the most polymorphous and protean of Lichen- 



* For minute anatomy vide Kiittlinger in ' Botanische Zeitung,' 1845, pp. 

 577-584. 



t For minute anatomy vide ' Botanische Zeitung,' March 23, 1855. 



