125 



dea, dilute castanea v. fuliginosa. 



— — — P. fiiliffinosa var. hvtevirens Flot. 



Thallus sorediosus v. verrucis piiinuni isidiophoris, dein 



sorediose dehiscenlibus iiuinitus. 



A. Saxicola Thalli ol)scure castanei v. nigricantis laciniaj 

 angustse; venucie sorediosjt valde elevata*, subslipitatsc. 

 Stratum meduUare hypochlor. calc. non reagens. Sporae 

 9 — 11 [i longse, 6.5 — 1 -b n. crassse. — — — — — — 



— — — — — P. sorediata (Ach.) Th. F^r. 



B. Corlicicola2. Thalli opaci, olivacei, castanei v. cinereo- 

 viridis lacinise latiusculse v. lata?; verrucse sorediosai 

 parva% sessiles v. fere adpressie. Stratum medullare 

 hypochlor. calc. rubescens. 



a. Thalli tenuiusculi, olivacei, castanei v. dilute fuligi- 

 nosi lacinise substrato arcte adpressie; stratum corti- 

 cale tenue. Soredia luteola. Sporae 13 — ^16 // longse, 

 7 — 8.5( — 9) a crassa?. — — — P. siibaiirifera Nyl. 



b. Thalli crassiusculi, plus minusve dilute olivacei v. 

 cinereoviridis lacinia^ substrato minus arcte adpressse, 

 sa3pe nonnihil adscendentes; stratum corticale cras- 

 sum. Soredia alba. — — P. siibargentifera Nyl. 



