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Sect. 3.—SPORES MURIFORM-MULTILOCULAR. 
V. terrestris (Th. Fr. sub Polyblastia, Lich. Arct. p. 265, & herb.). On 
the earth. Arctic America (Behring’s Straits) Mr. Wright. Apothecia 
clothed by the thallus; but becoming at length naked. In this species. 
Polyblastia, Mass., appears scarcely to be separable from Sporodictyon, 
Mass., except by the condition of the paraphyses. 
LXVIII.-PYRENULA (Ach.) Naeg. & Hepp, emend. 
Pyrenula (excl. Sagediis) Naeg. & Hepp in Hepp Flecht. Eur. t. 2, & passim. 
Pyrenulespp., & Verrucarie spp., Ach. Syn. pp. 117, 87. Eschw. Syst. 
p.16. Pyrenulamax. p., & Verrucaria max. p., Fée (Ess. p. 40) Suppl. 
pp. 76, 84. Verrucarie spp., Turn. & Borr. Lich. Brit. p. 203. Borr. 
in E. Bot. Suppl. Fr. 8. 0. V. p. 264; L. E. p. 443. Mey. Entwick. 
p. 329. Scher. Spicil. p.54. Mont. Apere. Morph. p.11. Tuck. Syn. 
N. Eng. p. 86. Leight. Brit. Ang. Lich. p. 35. Nyl. Pyrenoc. p. 40, 
&e.; Lich. Scand. p. 279; in Prodr. Nov. Gran. p. 113; Syn. Lich. N. 
Caled. p. 84; Add. Nov. ad Lich. Eur. in Flora Ratisb. Pyrenula pro 
p., & Verrucaria pro p. Scher. Enum. p. 212. Pyrenula, Blastodes- 
mia, Arthopyrenia pro p., Acrocordia pro p., Bunodea, Polyblastia 
spp., & Microthelia, Mass. Opp. var. Acrocordia pro p., Microthelia 
prop., Arthopyrenia pro p., Pyrenula, Blastodesmia, & Polyblastie spp., 
Koerb. (Syst.) Parerg. p. 333. Th. Fr. Gen. p.106. Pyrenula, Acro- 
cordia pro p., Arthopyrenia, & Microthelia, Anz. Catal. Sondr. p. 108. 
Pyrenula, Thelidium pro p., & Arthopyrenia pro p., Mudd Man. Brit. 
Lich. p. 297. Sagedia sect. 2, pro p., Arthopyrenia sect. 3, Microthelia 
pro p., Pyrenula, & Sporodictyon pro p., Stizenb. Beitr. 1. ¢. p. 147. 
Structuram exposuerunt Tulasne, Mém. sur les Lich. pp. 58, 192; 
Fuisting, 1. c. p. 51. 
Apothecia emerso-denudata, perithecio atro, amphithecio pallido 
]. dein nigricante, paraphysibus capillaribus nune diffluxis. Spore 
ex ellipsoideo oblong, bi-quadri-pluriloculares, demum et muriformi- 
multiloculares, fuscescentes 1. decolores. Spermatia oblonga, bacil- 
laria, 1. acicularia; sterigmatibus simplicibus. Thallus hypophlceodes 
obsolescens, rarius epiphlceodes. 
There can be no doubt that the passage from the Segestriei to the sub- 
family now before us is a descent; or that the carbonaceous exciple is 
inferior to the coloured. We have seemed however to find that there are 
some appreciable degrees in this degradation of the Verrucariaceous 
apothecium. Acicular spores lift up the little group of Sagedie to a 
higher spore-series than that to which almost the whole remainder of the 
tribe should seem to be referable; and place it therefore at the head of 
the Pyrenulei. It is not surprising then that this group should embrace 
