312 E. A. Vainio, Lecideales. 



18. Rh. hyalescens Vain. (n. sp.). 



Thallus crustaceus, uniformis, areolatus, areolis con- 

 tiguis, incrassatis, leviter convexis aut planis, laevigatis, 

 cinereo-fuscescentibus aut livido-cinerascentibus, baud prui- 

 nosis, KHO non reagentibus, medulla jodo plus minus 

 distincte violascente, hypothallo nigro. Apothecia nigra, 

 nuda, plana, inter areolas sita, baud prominentia, baud 

 papillata, immarginata aut tenuiter marginata. Epitbecium 

 vulgo rubricoso-fuscescens. Sporae 8:nae, decoloratae aut 

 parce demum dilute aeruginoso-nigricantes, long. O.020 — O.032, 

 crass. 0.009 — O.ois mm, diu 3-septatae, demum submurali- 

 divisae, cellulis paucis. 



Distr. In latere saxi granitici in litore sinus Vibur- 

 gensis prope Papula Viburgi („L. distincta" in Vain. Licb. 

 Vib., 1878, p. 68). In saxo granitico ad T0I6 Helsingforsiae 

 (Vain.). 



Thallo crassiore et apotheciis baud prominentibus a Rh. 

 distincto differens, f. aeruginascente, sporis demum obscuratis 

 instructa, in Rh. grandem fere transit et forsan regressu ab eo 

 evolutum. Thallus sat crassus aut modice incrassatus, crass. 

 0.5 — 0.2 mm, areolis angulosis, difformibus, lat. I.5 — O.2 mm, 

 medulla KHO cum CaClaOs non reagente. Apothecia lat. O.4— 0.8 

 mm, saepe angulosa, late adnata, basi baud constricta, disco 

 laevigato. Perithecium fuscofuligineum. Hypothecium rubricoso- 

 fuscescens. Epitbecium rubricoso-fuscescens aut raro parce aeru- 

 ginoso-fuligineum. Paraphyses apice leviter incrassatae. Sporae 

 strato gelatinoso sat crasso indutae, primum septis 3 transversis, 

 loculo uno aut loculis duobus septo uno longitudinal! obliquove 

 divisis. Gonidia cystococcoidea, globosa, diam. O.oos — O.ou mm, 

 chromatophoro anguloso, vacuolis lateralibus, membrana sat 

 tenui. Partes rubricoso-fuscescentes, KHO distinctius purpureae 

 evadunt. 



F. aeruginascens Vain. 



Sporae long. O.023 — O.028, crass. O.oii — O.oie mm, primum 1-septatae, 

 deinde irregulariter divisae, cellulis 5 — 6, demum aeruginoso-obscura- 

 tae. Thallus modice incrassatus, areolis planis, contiguis, livido-cine- 

 rascentibus. Apothecia baud prominentia, margine baud aut parum 

 distincto. Hypothecium et epitbecium rubricoso-'fuscescentia, KHO 

 solutionem purpuream effundentia. 



