222 Acta Societatis ])ro Fauna ct Flora fpnnira, Vir. 



tis aut rariiis acutinsculiri, loi-ulis cyliuilricis, foro aocjuc longis 

 aut duobus jucdiauis pauUo lou;^ioribus, paricle sacpe gelalinoso- 

 incrassalo. 



3. P. nucula Ach., 8yn. Lich. (1814) p. 112; Miill. Arg., 

 Lich. Beitr. (Fl. 1883) ii. 649, Pyrenoc. Cub' (1885) p. 400, Pyr. 

 Peean. (1888) p. 22. Verrucaria Nyl., Exp. Pyrenoc. (1858) p. 40, 

 Lich. Nov.-Grcan. (1863) p. 488, Syn. Nov. Cal. (1868) p. 85. 



Tliallus sat tcnuis aut crassitudine mediocris, leviter inae- 

 qualis aut verruculosus. glaucescens aut cinereo- vel olivaceo- 

 vel albido-glaucescens, subopacus. Exciimlum verrucam 0,8 0,4 

 millim. latam, demum depresso-subglobosam, aut hemisphaericam, 

 basi demum constrictam, aut abruptam, vertice demum saepe 

 anguste umbilicato-impressam formans, amphithecio thallino, thallo 

 concolore (aut apice anguste rufescente) omnino obductum aut 

 apice impresso angustissime denudato, perithecio paUido. Sporae 

 8:nae, fusiformes, vulgo 7-septatae, (raro pro parte 9-septatae), 

 long. circ. 0,0 48 0,0 6 0, crass. 0,oo8 0,oi2 f 0,oi5"] millim., 

 cellulis vulgo fere aeque longis. 



Ad cortices vetustos arborum prope Sitio, n. 1152, et La- 

 fayette, n. 331 (1000 metr. s. m.), et in Carassa (1400 metr. s. 

 m.), n. 1375, in civ. Minarum. Hypothallus indistinctus. Oo- 

 nidia chroolepoidea, circ. O.oos 0,oo6 miUim. crassa, membrana 

 sat tenui aut crassiuscula. Amphithecium gonidia continens. Fe- 

 rithecium in vertice extus testaceum, ceterum pallidum, KHO ru- 

 fescens. Nucleios albidus, jodo haud reagens, circ. 0,3 2 miUim. 

 latus. Paraj^hyses 0,ooi milHm. crassae, simplices aut nonnullae 

 furcatae, haud connexae. Asci oblongi. Sporae decolores, api- 

 cibus acutis aut obtusiuscuHs aut raro obtusis, loculis cylindricis, 

 pariete vulgo tenui, aut (in eodem apothecio) gelatinoso-in- 

 crassato. 



4. P. desqiiamescens Fee, Ess. Crypt. Ecorc. Suppl. (1837) 



p. 75; Mass., Ric. Lich. Crost. (1852) p. 192 pr. p.; Miill. Arg., 

 Pyr. Feean. (1888) p. 23. Verrucaria Nyl., Exp. Pyrenoc. (1858) 

 p. 39 pr. p. (excl. specim. in mus. Paris. asservatis). 



Thallus sat tenuis aut crassitudine mediocris, sat laeviga- 



tus, giaucovirescens, nitidiusculus. Exciimlum verrucam 1 0,4 



millim latam, hemisphaericam, basi sensim in thallum abeuntem 



formans, amphithecio thallino, thallo concolore maxima parte ob- 



ductum, vertice sat late aut sat anguste denudato, pallido aut ru- 



