296 E. A. Vainio, Lecideales. 



Hymenium circ. O.iso mm crassum. Epithecium olivaceum aut (in eodem 

 apothecio) rubricoso-fuligineum. Paraphyses parce ramoso-connexae, 

 gelatinam sat abundantem percurrentes. Sporae „typice decoloratae, 

 long. 0.025 — 0.030 mm, crass. O.012 — O.015 mm, septis transversis 3 — 5" 

 (sec. Flag, et Arn.), demum „valde murales" (sec. Flag.), „Sterigmata 

 simplicia", conidia „cylindrica, recta" (sec. Flag.). Gonidia cystococcoi- 

 dea, simplicia, globosa, diam. O.oos — O.oio mm, aut subellipsoidea et diam. 

 0.012 X 0.C09 mm, membrana sat tenui. 



F. excentrica (Ach.) Vain. Lecidea petraea ,j. excentrica Ach. 

 Meth. Lich. (1803) p. 37, Lich. Univ. (1810) p. 156. L. petraea *L. ex- 

 centrica Nyl. Lich. Scand. (1861) p. 234. Rh. excentricum Arn. Lich. 

 Frank. Jur. (Fl. 1884) p. 200 (564), Lich. Miinch. (1891) p. 94; Flag. Lich. 

 Franche-Comte II (1894) p. 500. L. petraea 7. L. callistea Ach. Meth. 

 Lich. Suppl. (1803) p. 9 (ad hanc Malme Lich. Suec. Exs. XIV, 1913, 

 n. 350 pertinet). 



Thallus modice incrassatus aut sat tenuis, albus aut albidus 

 (aut cinerascens in callistea Ach.), nigro-limitatus aut lineis nigris de- 

 cussatus aut hypothallo indistincto. Apothecia sparsa aut irregulariter 

 aggregata, disco nudo, margine modice incrassato aut sat tenui, 

 nigricante nudoque aut cinerascente et tenuiter pruinoso. 



Sec. Th. Fr. Lich. Scand. II p. 633 in Enontekis in Lapponia 

 Tornoensi a Norrl. collecta est, sed specimen (ad Kelottijarvi lectum), 

 ad quod verisimiliter spectatur, „L. petraea f. subcontigua" a Nyl. 

 determinatum (cum annot. „vix differt ab excentrica Ach."), thallo 

 cinereo, areolato-diffracto, apotheciis p. p. papillatis, margine sat 

 crasso cinctis, instructum, ad Rh. obscuratum f. fuscocineream (Krem- 

 pelh.) Arn. pertinet. 



Obs. Lecidea persimilis Nyl., Ad Veg. Lich. Helsingf. Sav. (Not. 

 Sallsk. F. Fl. Fenn. Forh. IV, 1859) p. 237, Lich. Scand. (1861) p. 236 

 (Rh. calcareum jS. concentricum i. persimilis Blomb. et Forss. En. PI. 

 Scand., 1880, p. 94), sec. Th. Fr. Lich. Scand. II p. 633 est forma ligni- 

 cola var. excentricae, quod autem incertum mihi videtur, quia Rh. con- 

 centricum locis normalibus crescens in Fennia rarissimum est. Ceterum 

 haec forma, parcissime lecta, vix certe determinabilis est. A Rh. ob- 

 scurato f. xylogena Th. Fr. apotheciis baud distincte papillatis, tenuiter 

 marginatis et hymenio baud aeruginoso differt. Thallus sordide sub- 

 cinerascens, areolatus, baud pruinosus, hypothallo indistincto. Apo- 

 thecia lat. 0.4 — 0.3 mm, disco nigro, nudo, piano aut leviter convexo, 

 margine sat acuto, nigro, nudo. Epithecium olivaceum aut fuscescens 

 in eodem apothecio. Hypothecium et perithecium rubricoso-fuligineum. 

 Paraphyses gelatinam sat abundantem percurrentes. Sporae „decolores 

 aut demum leviter obscuratae, 3-septatae, long. O.019 — O.024, crass. O.oos — 

 0.009 mm, halone circumdatae" sec. Th. Fr. (in apothecio a me examinato 



