124 



1. Thallus margine ciliis sparsis, supra verrucis parvis spar- 

 sis, apice nigricantibus. nitidis et impressis niunitus. Sporse 

 8 — lOi — 11) //longse, 6.6 — 8.5^ — 9) u crassa\ — P. asperaMass. 



2. Thallus neque ciliis neque verrucis munitus. 



A. Corticicola (v. lignicola). Thalli lacinia' latiuscuhe, apice 



rotundat?e. Sponx' 13 — 16( — 18) /a longas, (6 — )7 — 9 //. 

 crassa\ — — — — — — — — P. oliuacea (L.) Ach. 



B. Saxicola?. Thalli lacinise angustai, apice vulgo trun- 

 cata?. Spora? 7 — 8.5( — 9.5) ff. longae, 4.5 — 5.5( — 6) // 

 crassae. 



a. Thallus haud microphyllinus; apolhecia vulgo nu- 

 merosa. — — — — — — P. prolixa (Ach.) Nyl. 



b. Thalli lacinia^ e marginibus laciniolas emittentes 

 angustissimas, adscendentes v. suberectas, coralloi- 

 deas, crustam niicrophyllinam saepe formantes; 



apothecia nulla v. rara. — — — — — — 



— — — — — — P. prolixa var. panniformis Nyl. 



II. Thallus isidiis v. soralibus munitus; apothecia vulgo nulla v. 

 rara. 

 1. Thallus isidiis veris niunitus, haud sorediosus. 



A. Isidia crassa, opaca, thallo vulgo pallidiora, in verru- 

 cas ssepe moriformes conferta. Stratum corticale cras- 

 sum; stratum medullare hj^pochlor. calc. haud reagens. 

 Sporae 7 — 8..^( — 9) a longse, \.:> — ö.ö[ — 6) n crassse. 

 — — — — — — — P. prolixa var. isidiotijla (Nj^l.). 



B. Isidia numerosa, supra thallum subiequaliter sparsa. 

 Stratum corticale thalli tenue. 



a. Thallus tenuissimus. Stratum medullare hypochlor. 

 calc. non reagens. Isidia vulgo clavata, nitida, 

 vulgo simplicia. Sporse 7 — 9 a longa', 6 — 7( — 7.r>) 

 u crassa'. — — — — — — P. exasperatiila Nyl. 



b. Thallus tenuiusculus. Stratum medullare hypochlor. 

 calc. rubescens. Isidia cylindrica, gracilia, vulgo 

 opaca. Spone 11— 13(— 14) n longa% 7— 8(— 9) // 

 crassa;. 



«. Saxicola (saltem vulgo). Thallus obscure oli- 

 vaceus, fuliginosus v. castaneus. Isidia subsimpli- 

 cia, nigricantia v. nigra. — P. fiiliffinosa (Fr.) Nyl. 



fi. Corticicola (sallem vulgo). Thallus dilutius oli- 

 vaceus v. cinereoviridis. Isidia vulgo coralloi- 



