143 



a. membranacea Th. Fr.: thallo membranaceo tenui, livido 1. fusco- 

 coerulescente , subtus albido, nudo, lobis fertilibus minus venosis, fere laeviga- 

 tis; apotheciis rufis. Rbnh. exs. n. 351. Forma australior, nemorosa, in 

 regionibus arcticis non obvia, a sequentibus magis recedens et fortasse species 

 distincta. 



b. parilis (S mr ft.): thallo coriaceo-membranaceo, olivaceo- 1. rufescenti- 

 fusco, subtus tenuissime tomentoso, nigricante marginibus pallidis, lobis fertilibus 

 eximie venosis; apotheciis rufo-fuscis. Pelt, parilis a. Smrft. 1. c., exs. n. 

 70. Forma ad rupes apricas in terris arcticis frequens. 



c. helvetica (Ach.): thallo cartilagineo-membranaceo, olivaceo- I. vire- 

 scenti-castaneo, subtus tomento marginibus pallido, praeterea nigricante densissime 

 vestito, lobis fertilibus elevato-rugosis rimulosisque ; apotheciis badiis. Ach. 

 Univ. p. 523 sec. descr. ; Pelt, laevigata Smrft. 1. c. p. p. Prior locis um- 

 brosis obvia, omnibus partibus major, thallo magis expanse, rarius fructiiicans. 



Formae b. adscribenda est Pelt, resupinata d. helvetica Fr. 1. c. in ra- 

 mis pinuum obvia; Schaer. exs. n. 260 hanc quidem exhibet, non tamen bo- 

 nam. Moug. et Nestl. exs. n. 252 ad hanc speciem relatus et b. parilem 

 et N. tomentosum continet. 



Asci inflato-clavati, paraphyses validiusculae, laxe cohaerentes, apice ful- 

 vescentes fuscescentesve; sporae octonae, subfusiformes, tetrablastae, luteolo-hya- 

 linae, 0,oi8 20 mm. longae et 0,004 5 mm. latae. In b. et c. cyphellae albae 

 baud raro observantur; illius formae apothecium in herb. Smrft. vidi diam. 

 unciali. 



10. Peltigera Hoff. emend. 



Thallus foliaceus, subtus villosus venosusque. Apothecia thalli lobis 

 antice adnata, peltata, velo thallode primitus tecta; hypothecium simplex 

 strato rnedullari impositum; sporae aciculares 1. fusiformes, 4-plejoblastae, 

 incoloratae. 



1. P. aphtosa (L.): thallo coriaceo, humido laetissime viridi, sicco 

 glaucescente, verrucis obscurioribus adsperso , subtus venis nigricantibus mox 

 confluentibus obtexto; apotheciis subrotundis, margine lacero. 



Syn. Peltidea aphtosa Ach. Univ. p. 516, Syn. p. 238, Wnbg. Lapp, 

 p. 446. Peltigera Fr. L. E. p. 44, Schaer. Enum. p. 19, Mass. Mem. 

 p. 22, Koerb. Syst. p. 58. 



Exs. L. Su. n. 178. Schaer. n. 29. Stenh. n. 37. 



Locis humidis umbrosisque per totam Scandinavian), Lapponiani Ke- 

 inensem et Rossicam (hb. Mus. Petrop.), Islandiam (Stenstr.), Spitsber- 



