CRYPTOGAMIA LICHENES. 77* 



.M>. OPEGRAPHA. Frond crustaceous, thin, adnate. Apotheciu 

 linear, black, sessile or somewhat immersed, having a lon- 

 gitudinal and mesial cleft. 



r>D. ARTHONIA. Frond crustaceous, thin, adnate. Apothecia ses^ 

 sile or somewhat immersed, of an irregular roundish figure, 

 without a border. 



* * * * Apothecia, tubercular or granular p , sessile , sometimes perforated 

 on the apex. 



(H. SPILOMA. Frond crustaceous, thin, adnate, uniform. Apo- 

 thccia composed of minute bodies collected into a compact 

 granular coloured mass. 



(>L VARIOLARIA. Frond crustaceous, plane, spreading, adnate, 

 uniform. Apothecia wart-like, formed from the crust, gra- 

 nular, submarginate, white, including a naked nucleus. 



(>"2, \ T ERRUCARIA. Frond crustaceous, thin, adnate. Apothecin, 

 hemispherical, somewhat immersed, furnished with a mi- 

 nute prominent orifice. 



C"$. PORIXA. Frond crustaceous, tuberculated, adnate, Apothe- 

 cia imbedded in the tubercles, and opening by an obvious 

 pore. 



(') L I^XDOCARPOX. Frond crustaceous, adnate, of some determi- 

 nate form ; or foliaceous and peltate. Apothecia globose, 

 concealed in the substance of the plant, surrounded by a 

 thin membrane, furnished with a slightly prominent ori- 

 fice, and containing a nucleus. 



* * * * * Lichens destitute of Apothecia^ and whose fructification is 

 unknown. 



<)">. LEPRARIA. Frond a pulverulent and fibrous crust, spread- 

 ing, adnate, uniform. 



39. PELTIDEA. 



1. jP canine, frond broad, irregularly lobed, bluish-grey, wrink- 

 led, beneath white, with prominent woolly veins, fibrous ; apothecia 



