814 E. A. Vainio, Lecideales. 



20. Rh. postumum (Nyl.) Th. Fr. 



Lich. Scand. II (1874) p. 634; A. Smith Mon. Brit. Lich. II (1911) 

 p. 196. Lecidea postuma Nyl. Fl. 1868 p. 345 (conf. infra), En. Lich. 

 Fret. Behr. (1888) p. 59 (herbario Nyl. deest), Lich. Jap. (1890) p. 82 

 <herb. Nyl. deest); Leight. Lich. Great Brit. 3 ed. (1879) p. 349; Hue 

 Addend. II (1888) p. 217. 



Thallus crustaceus, uniformis, tenuis, sat evanescens, 

 impure albidus, baud pruinosus, nee KHO, nee jodo reagens, 

 hypothallo indistincto. Apothecia parva aut minutissima, 

 nigra, nuda, leviter prominentia, disco piano, vulgo baud 

 papillate, tenuiter marginata. Epitbecium rubricosum. Spo- 

 rae 8:nae, decoloratae aut demum fumosae vel dilute nigri- 

 cantes subfuscescentesve, submurales, septis transversis 3, 

 long. 0.014—0.017 mm (— O.on mm sec. Tb. Fr.), crass. O.ooe — 

 0.009 mm. 



Distr. In rupe micaceo-scbistosa ad Letku in Tammela 

 in Ta. (A. Kullbem). 



In hoc specimine thallus est variabilis, minute verruculosus 

 dispersusque aut partim subcontinuus et verruculoso-inaequalis. 

 Apothecia crebra, lat. 0.2 — 0.3 mm, parce etiam — 0.6 mm, tenuia, 

 substrato late adnata, basi baud constricta, disco raro papillato, 

 partibus rubricosis KHO pulchrius coloratis. Perithecium fusco- 

 aut rubricoso-fuligineum. Hypothecium rubricoso-fuligineum. 

 Hymenium circ. O.120 mm crassum. Epitbecium rubricosum aut 

 subfuscescens. Paraphyses gelatinam sat abundantem percurren- 

 tes, sat increbre septatae, crass. O.0015 mm, apice circ. O.003 mm. 

 Sporae septis transversis 3, uno loculo septo uno longitudinali 

 diviso, strato gelatinoso tenui saepe indutae. Gonidia globosa, 

 simplicia, diam. O.008 — O.006 mm, membrana tenui. 



Obs. Specimen orig. L. postumae Nyl., n. 10144 e Scotia in herb. 

 Nyl., thallo instructum est tenui, areolato, areolis O.2 — O.5 mm latis, 

 difformibus, planis aut convexis, laevigatis aut parce subverruculosis, 

 albidis, subdispersis, hypothallo indistincto, apotheciis O.2 — O.3 mm latis, 

 leviter prominentibus, tenuiter marginatis, disco piano, laevigato, baud 

 aut leviter papillato, „epithecio fuscescente, sporis long. O.015 — O.oie, 

 crass. 0.006—0.007 mm, incoloribus (vel fuscescentibus), 3-septatis 

 (additis saepius septulis obliquis vel longitudinalibus parcis)", sec. 

 Nyl. I. c. 



