86 E. A. Vainio, Pyrenocarpeae. 



1. Placidiopsis Beltram. 



Lichenogr. Bassan. (1858) p. 213; Koerb. Parerg. Lich. 4 Lief. 

 (1863) p. 305; Th. Fr. Gen. Heterolich. (1861) p. 104; Stizenb. Beitr. 

 Flechtensyst. (1861) p. 150; Zahlbr. Ascolich. (1903) p. 58, 60. Bohleria 

 Caratt. 12 Nuov. Gen. Lich. (1853) p. 10 (sec. Zahlbr. I.e.). Endocarpi- 

 dium Mull. Arg. Princ. Class. Lich. (1862) p. 73. Catopyrenium Jatta 

 Fl. It. Crypt. Lich. p. 793 p. p. (haud Flot. ). Placidium Schwend. Unters. 

 Flecht. II (1863) p. 189 (haud Mass.). 



Thallus subfoliaceus aut squamosus, superne strato 

 corticali plectenparenchymatico, ex hyphis verticalibus con- 

 glutinatis formato, obductus, tomento hypothallino affixus. 

 Apothecia thallo immersa, gonidiis hymenialibus destituta. 

 Paraphyses in gelatinam diffluxae. Sporae decolores, demum 

 1 — 3-septatae. Gonidia pleurococcoidea. 



1. PI. cervinula (Nyl.) Vain. 



Verracaria cervinula Nyl. Fl. 1864 p. 354, Lich. Lapp. Or. (1866) 

 p. 169. Dermatocarpon Th. Fr. Enum. Plant. Scand. (1880) p. 354. 



Thallus subfoliaceus, subplicato-convexiusculus, mar- 

 gine partim leviter convoluto, late adnatus, margine partim 

 libero, integer aut leviter crenatus lobatusve, long, et 

 lat. 3 — 1 mm, superne cervinus vel cinereo-fuscescens, 

 opacus, haud pruinosus, subtus nigricans, hypothallo ni- 

 gricante. Apothecia crebra, thallo immersa. Perithecium 

 nigricans, integrum, tenue, margine ostiolari haud aut 

 parum prominente, nigricante. Sporae ellipsoideae oblon- 

 gaeve. 



Distr. Ad terram arenosam prope Ponoi in Lapponia 

 orientali (N. I. Fellman) parce lecta. 



Dermatocarpon hepaticum et D. meiophyllum (= D. lepto- 

 phyllurn Nyl.) facie externa in memoriam revocans, sed perithecio 

 integre obscurato et sporis uniseptatis ab iis differens. Thallus 

 humidus crass, circ. O.220 mm, hyphis hypothallinis O.003 — O.0055 

 mm crassis, fuscescentibus aut primum decoloribus. Perithecium 

 lat. circ. O.120 — O.140 mm, sub microscopio fusco-rufescens, in 

 vertice circ. 0.o:io mm erassum, in latere circ. O.006 — O.012, in basi 

 O.012 mm erassum. Periphyses long. circ. O.030, crass. O.ooj mm, 

 increbre septatae. Paraphyses in gelatinam diffluxae. Asci sub- 

 ventricosi, long. circ. O.044 — 0.05r>, crass. O.012 mm, membrana 



