28 Acta Societatis pro Fauna et Flora feunica, VII. 



in zona infra stratum corticale superiiis thalli disposita. Stratum 

 corticale siq^ferius pseudoparenchymaticum, ex hyphis formatum 

 verticaKbus (aut ramis subhorizontahbus parce instructis), conghi- 

 tinatis, parenchymatice septatis, membrana incrassata, locuKs mi- 

 nutissimis. Stratmn medullare stuppcum [in subg. Menegazzia 

 (Mass.) fistulosum], hyphis implexis, tenuibus (circ. 0,oo2 0,0 3, 

 raro 0,oo5 milHm. crassis), membranis incrassatis,' lumine tenuis- 

 simo. Apotliecia supra thahum sparsa. Exciimlum thallodes, 

 strato corticah pseudoparenchymatico, strato medullari ex hyphis 

 pachydermaticis contexto, zonam gonidialem infra hypothecium 

 et vulgo etiam glomerulos sparsos gonidiorum infra stratum cor- 

 ticale continente. Hypotlieciiim albidum aut palhdum. ParapJiyses 

 gelatinam firmam percurrentes. Sporae 8:nae aut raro 4:nae vel 

 2:nae, elhpsoideae aut globosae aut oblongae, simphces, decolores. 

 Conceptacida pycnoconiclioriim thaho sparsa aut raro in margine 

 apotheciorum sita, thallo immersa aut rarius apice prominulo, 

 conceptaculo nigricante aut parte inferiore fuscescente [vel raro 

 decolore: Nyl., Syn. p. 375]. Steriymata pauciarticulata aut raro 

 exarticulata, in nonnuhis speciebus anaphysibiis vel fiiamentis 

 anastomosantibus immixta" (Linds., I. c). Fycnoconidia subbifu- 

 siformia aut cyhndrica aut raro subfusiformia, recta aut raro. 

 arcuata. 



Species infra enumeratae hujus generis omnes ad subg. EiiparmeUam 

 Nyl. (Hue, Addend. 1886 p. 3) pertinent. 



Sect. 1. Amphigymnia Wainio. Tliallus superne albidus 

 aut flavescens, subtus rhizinis instructus, at ambitus late nudus 

 aut tantum ipse margo cihis ornatus; apices marginesve lacinia- 

 rum adscendentes. Apothecia vulgo demum subpodicellata. 



*Subglaiicescens Wainio. TJiallas superne glaucescenti-al- 

 bidus albidusve. 



1. P. perlata Krempelh., Fl. 1869 p. 222; Nyl., (Syn. Cal. 

 1868 p. 17) Fl. 1869 p. 290, Fl. 1878 p. 247, Fl. 1885 p. 608 

 pr. p. (excl. v. sorediata Nyl., quae margine thalh cihato diifert) ; 

 Hue, Addend. (1886) p. 41. Ach., Meth. Lich. (1803) p. 216 

 pr. p.; Th. Fr., Lich. Scand. (1871) p. 111 pr. p. Lichen perlatus 

 L., Syst. Nat. ed. XII (1767) p. 712 pr. p. ? 



Tliallus giaucescenti-albidus aut pahido-glaucescens, subtus 



niger aut ambitu castaneus pahidusve, laciniis circ. 15 5 miUim. 



\ 



V. 



