284 E. A. Vainio, Lecideales. 



Gall. Exs. VI (1904) n. 297. — Zahlbr. Krypt. Exs. Vindob. XIII (1905) 

 n. 1236. (P. p. sec. cit.) 



Thallus crustaceus, uniformis, verrucosus areolatusve, 

 areolis contiguis aut rarius partim subdispersis (vel in var. 

 bene dispersis), convexis aut partim sat planis, flavescenti- 

 bus aut demum glaucescentibus cinerascentibusve, KHO 

 superne intusque non reagentibus, esorediatis, intus strami- 

 neo-flavescentibus, jodo non reagentibus, hypothallo evane- 

 scente aut rarius (in v. Oportensi) bene evoluto nigricante- 

 que. Apothecia nigra, nuda, plana aut demum convexa, 

 immarginata aut primum tenuiter marginata, sat parva. 

 Sporae 8:nae, demum fuligineae, diu 3-septatae, demum 

 submurales, long. O.022— O.027 mm aut sec. annot. Nyl. „Iong. 

 0.018 — 0.025, crass. O.oos — O.012 mm", cellulis paucis. 



Distr. Ad saxa gneissacea et granitica rarissima. 

 Ab.: Karjalohja (J. P. Norrlin, n. 10488 in herb. Nyl.). 

 Ta. : In littore lacus Paijanne prope Tientaali in Luhanka 

 (Vain. Fl. Tav. Or. p. 117). 



Praecipue thallo intus stramineo-flavescente (jodo baud cae- 

 rulescente) et extus saepe (praesertim in natura) flavido et cellulis 

 sporarum constanter paucis a Rh. geographico et Rh. grandi 

 distinguitur. Thallus persistenter flavidus (talis adhuc in Plot. 

 Lich. Exs. n. 192 in herb. Nyl.) aut saepius colore alternans, ita 

 ut primo aspectu subflavescens appareat deindeque mox distincte 

 cinerascens videatur, quae insig-nis mutatio coloris praesertim 

 tempestate serena observatur, areolis circ. O.4 — 1.3 mm latis, 

 acidum rhizocarpicum continens sec. Zopf (Ann. Chem. B. 313 

 p. 334, Fiechtenst, 1907, p. 402). Apothecia late adnata, basi 

 baud constricta, thallo immersa aut inter areolas sita aut raro 

 leviter prominentia. Peritbecium tenue, fuligineum. Hypothecium 

 rubricoso-fuscescenti-fuligineum, KHO purpureum. Hymenium circ, 

 0.100 — 0.120 mm crassum, jodo persistenter caerulescens. Epithe- 

 cium fuligineum, KHO purpurascens. Paraphyses ramoso-connexae, 

 gelatinam parcam percurrentes, cellulis oblongis, apice incrassatae. 

 Sporae strato gelatinoso tenuiore crassioreve, decolorato indutae, 

 oblongae ellipsoideaeve, apicibus rotundatis, 1 — 3-septatae, loculis 

 (1 — 3) septo uno longitudinali divisis. Gonidia cystococcoidea, 

 globosa, diam. O.009 — O.ois mm, chromatopboro difformi, anguloso, 

 vacuolis lateralibus, membrana sat tenui, nonnulla autosporas 

 baud valde numerosas, subglobosas, diam. O.004 — O.ooe mm con- 

 tinentia. 



