Acta Societatis pro Fauna et Flora Fennica 49, N:o 2. 23 



plus minusve distincto. Apothecia crebra, thallo immersa. 

 Perithecium albidum aut testaceo-pallidum, margine ostiolari 

 nigricante, saape demum leviter prominente. Sporae oblongae 

 ellipsoideaeve. 



Distr. Supra muscos et terram humosarn praesertim 

 locis calcariis supra rupes. Alandia (Edvin Nylander). Regio 

 Aboensis: Insula Jurmo in Korpo (Edvin Nylander), Pellon- 

 kyla in Karjalohja (J. P. Norrlin). Nylandia: Mons Obser- 

 vatorii Helsingforsise (W. Nylander a. 1851). Tavastia austr. : 

 Letku in Tammela (A. Kullhem). Karelia Onegensis: Valkea- 

 maki (Th. Simming). 



Thallus squamis circ. 3—7 ( — 20) mm longis, lobis 1.5 — 

 0." mm latis, humidus crass. 0-iso — 0.2 mm, hyphis hypothallinis 

 0.0035 — 0.004 mm crassis, fuscescentibus nigricantibusve aut primum 

 decoloribus. Apothecia saepe demum verruculas leviter prominen- 

 tes, nigricantes formantia. Perithecium lat. circ. 0.2 mm, sub 

 microscopio apice rufescens. Nucleus jodo sordide roseus. Peri- 

 physes long. O.010 mm aut breviores, crass. O.002 mm. Paraphyses 

 in gelatinam diffluxae, striis indicatae. Asci subclavati aut ven- 

 tricoso-clavati, long. circ. O.044, crass. O.014 mm, membrana gelati- 

 nosa, apice primum sat crassa. Sporae 8:nae, distichae, decolores, 

 simplices, ellipsoideae aut ovoideo-oblongae, apicibus saepe obtusis, 

 long. O.012 — O.017, crass. O.ooe — O.007 mm. Stratum corticale supe- 

 rius circ. 0.060 mm crassum, plectenparenchymaticum, leptoder- 

 maticum, cavitatibus cellularum O.003 — O.005 mm latis. Stratum 

 medullare hyphis in cellulas subglobosas O.007 — O.005 mm latas 

 leptodermaticas divisis, crebre irregulariter contextis, haud con- 

 glutinatis, interstitiis disjunctis, parce etiam angustioribus, O.003 

 mm crassis, cellulis oblongis ellipsoideisque. Stratum corticale 

 inferius haud evolutum. Thallus opacus, pruina destitutus (f. nuda 

 Vain.) aut raro tenuiter pruinosus (f. pruinosa Vain., ad Letku in 

 Tammela a Kullh. collecta). „Verrucaria cartilaginea f. pruinosa 

 Nyl." in Norrl. Ber. Torn. Lappm. (1873) p. 343, ad Koltapahta 

 in Enontekis lecta, p. p. ad Dermatocarpon fluviatile var. deci- 

 pientem (Mass.) pertinet, p. p. ad D. miniatum var. complicatum 

 (in v. decipentem accedentem). 



Obs. 1. Endocarpon cinereum var. cartilagineum Nyl., Coll. Lich. 

 Gall. Mer. (Nya Bot. Not. 1853) p. 8, in specim. orig. sporis uniseptatis 

 instructa, pertinet ad Placidium Custnani (Mass. Sert. Lich., 1856, p. 78), 

 quod nominandum est Placidiopsis cartilaginea (Nyl.). 



Obs. 2. Verrucaria psoromoides Borr. (Engl. Bot. Suppl., 1829, 

 tab. 2612 f. 1), secundum specim. orig. Borreri in Leight. Brit. Angioc. 



