Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 311 



Distr. Supra rupes, lapides et saxa, granitica, quart- 

 zosa et porphyrica, locis apricis crescit. Al.: (E. Nylander 

 sec. Th. Fr. 1. c. p. 626). Ab.: Lohja (C. E. Boldt). N.: 

 Hoglandia (sec. determ. Nyl. in M. Brenner Bidr. Hogl. Lafv. 

 p. 112), Helsingforsia (W. Nyl. sec. Th. Fr. 1. c), Gesterby 

 in Kyrkslatt (G. Lang). Oa.: (A. J. Malmgren sec. Th. Fr. 

 1. c). LTul.: Ins. Kildin (N. I. Fellman Lich. Arct. n. 196 

 sec. determ. Nyl. in herb, suo, „L. petraea" in Nyl. Lich. 

 Lapp. Or. p. 162). 



Thallus areolis 0.3 — O.2 ( — O.5) mm latis, laevig-atis (raro 

 albidis in var. subalbicante Nyl. aut obscure fuscescentibus in 

 var. subobscurata Nyl. in Lamy Cat. Lich. Mont-Dore p. 171), 

 ..CaClsOs immutatis" (sec. Th. Fr.). Apothecia lat. O.4 — O.7 mm, 

 vulgo inter areolas thalli sita, late adnata, basi baud constricta, 

 thallum leviter superantia, vulgo crebra, disco laevigato aut rarius 

 subpapillato, margine tenui, leviter prominente aut excluso. 

 Excipulum obscure atropurpureum. Hypothecium nigrofuscum. 

 Paraphyses apice fuligineo-violascentes (sec. Th. Fr.) aut raro 

 olivaceae vel obscure virides (sec. Arn.). „Sporae incoloratae 

 vel demum pallide subolivaceae, 1— 5-septatae, 2 — 8-loculares, 

 halone crasso vel vulgo indistincto circumdatae. KHO paraphy- 

 sum apices obscuriusque excipulum violaceo-rubescunt, HNO3 

 tantummodo paullo dilutiores evadunt" (sec. Th. Fr.). „Sterigmata 

 simplicia. Conidia recta" (sec. Flagey Fl. Lich. Franche-Comte 

 p. 497), „acicularia, long. O.oio mm" (sec. Jatta 1. c. p. 690). 

 Gonidia cystococcoidea, globosa aut subglobosa, simplicia, diam. 

 0.012 — 0.006 mm, chromatophoro anguloso aut rarius chromato- 

 phoris 3 — 4, vacuoUs lateralibus, membrana sat tenui. 



Obs. 1. L. distincta f. subecrastacea Brenn. Bidr. Hogl. Lafv. 

 (1885) p. 112, in rupe porphyrica Hogiandiae lecta, a me non est 

 visa. 



Obs. 2. L. atroalbn a. ambigua Naeg. (1853) atque forsan etiam 

 L. confervoides ,J. areolata Schaer. (1850) nomina anteriora hanc spe- 

 ciem designantia sunt, quare in primis nomen areolatae restituendum 

 asset, si revera hue pertinet. Lex nomenclaturae prioritatem nominis 

 varietatis excludens est injusta, quare approbanda non est, praeser- 

 tim quum significatio speciei valde vacillans est. 



