28 Acta Societatis pro Fauna et Flora fenniea, VII. 



in zona infra stratum corticate superius thalli disposita. Stratum 

 corticale superius pseudoparenchymaticum, ex hyphis formatum 

 verticalibus (aut ramis subhorizontalibus parce instructis), conglu- 

 tinatis, parenchymatice septatis, membrana incrassata, loculis mi- 

 nutissimis. Stratum medullare stuppeum [in subg. Menegazzia 

 (Mass.) fistulosum], hyphis implexis, tenuibus (circ. 0,002— 0,0.0 3, 

 raro 0,005 millim. crassis), membranis incrassatis, lumine tenuis- 

 simo. Apothecia supra thallum sparsa. Excipulum thallodes, 

 strato corticali-pseudoparenchymatico. strato medullari ex hyphis 

 pachydermaticis contexto, zonam gonidialem infra hypothecium 

 et vulgo etiam glomerulos sparsos gonidiorum infra stratum cor- 

 ticale continente. Hypothecium albidum aut pallidum. Paraphyses 

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

 2:nae, ellipsoideae aut globosae aut oblongae, simplices, decolores. 

 Conceptavula pycnoconidiorum thallo 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]. Sterigmata pauciarticulata aut raro 

 exarticulata, „in nonnullis speciebus anaphysibus vel filamentis 

 anastomosantibus immixta" (Linds., 1. c). Pycnoconidia subbifu- 

 siformia aut cylindrica aut raro subfusiformia, recta aut raro 



arcuata. 



Species infra enumeratae hujus generis omnes ad subg. Euparmeliam 

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



Sect. 1. Amphigymnia Wainio. Thallus superne albidus 



aut flavescens, subtus rhizinis instructus, at ambitus late nudus 

 aut tantum ipse margo ciliis ornatus; apices marginesve lacinia- 

 rum adscendentes. Apothecia vulgo demum subpodicellata. 



*Subglaucescens Wainio. Thallus superne glaucescenti-al- 

 bidus albidusve. 



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

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

 pr. p. (excl. v. sorediata Nyl., quae margine thalli ciliato differ* ) : 

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

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

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



TJtallus glaucescenti-albidus aut pallido-glaucescens, subtus 

 niger aut ambitu castaneus pallidusve, laciniis circ. 15 -5 millim. 



