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sticta, Mont. (Syll. p. 361) with annularly plurilocular spores, should be 
rather associable, as Nylander has associated it, with his Phlyctis Boliv- 
iensis (Lindig herb. N. Gran. n. 900): and Phlyctis, whatever its affinity 
to Pertusaria, is without question much nearer to Thelotrema;. if indeed, 
in the last resort, it prove well separable from the latter. 
While the resemblances of Pertusaria to Lecanora have been recog- 
nized by authors, and illustrated especially by Fries (ZL. #. p. 419) the 
agreement has been general to consider these resemblances as relations 
rather of analogy than affinity, and, with scarcely an exception, the 
former genus has been placed among angiocarpous lichens. Nylander, 
on the contrary, assigns to his sub-tribe Pertusariei (Lich. Scand. p. 177) 
a place between his Eulecanorei (which includes Urceolaria) and his 
Thelotremei. Stizenberger (Beitr. 1. c. p. 167) follows the author just 
cited in referring Pertusaria to Parmeliacei; but neither distinguishes 
Urceolaria from his Lecanore@, nor the genus before us from Thelotremee. 
XXX.—PERTUSARIA, DC. 
DC. FI. Fr. 2, p. 319. Scher. Spicil. p. 64; Enum. p. 226. Fr. L. E. 
p. 418, addita Parmeliz sp. pr. p., p. 186. Leight. Brit. Angioc. Lich. 
p. 26, t.9, 10,11. Norm. Con. p. 27. Mass. Ric. p. 186. Naeg. et 
Hepp in Hepp Abbild. t. 2, etc. MKoerb. Syst. p. 381; Parerg. p. 310. 
Th. Fr. Lich. Arct. p. 258, addita Lecanore sp., p. 217; Gen. pp. 69, 
105. Mudd Man. Brit. Lich. p. 271. Porina, et Variolarix, Isidii et 
Lecanore spp., Ach. L. U.; Syn. Pertusaria, et Variolarie, Isidii et 
Thelotrematis spp., Turn. et. Borr. Lich. Brit. p. 191, etc. Pertusaria 
et Varicellaria, Nyl. Enum. Gen. p. 117; Lich. Scand. p. 177; Lich. 
exot. 1. c. pp. 220, 241; in Prodr. Fl. N. Gran. p. 35; Syn. Lich. N. 
Caled. p. 31. Stizenb. Beitr. 1. c. p. 167. Th. Fr. Lich. Scand. p. 322. 
Structuram exposuit Tulasne, Mém. sur les Lich. pp. 48, 59, 189, 
t. 11, f. 1-10. 
Apothecia globulari-difformia, clausa porisque pertusa, hymenia 
(1-00) nucleiformia includentia; aut explanata, lecanoroidea. 
Spore magne, ellipsoides, simplices 1. rarissime biloculares, incol- 
ores. Spermatia acicularia, recta; sterigmatibus simplicibus. 
Thallus crustaceus, uniformis. 
The genus is remarkable, no less for its typically compound apothecia, 
than for the transformation of these into soredia (described at length by 
Turner and Borrer, under Variolaria, Pers.) and of the thallus into that 
coralloid overgrowth which the older writers distinguished as Isidium. 
‘Hee Variolarie et precipue Isidii formatio, remarks Fries, ‘reliquis 
plerisque Angtocarpis peregrina (nam ad omnes Lichenes hec metamor- 
phosis incaute extenditur) etiam afinitatem cum Parmeliis confirmat. 
