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on simple sterigmas. TZhelenella then will also appear to be fully associable 
with Segestria.* 
It is not at once easy to follow those recent writers who have united 
what Koerber has distinguished as Weitenwebera (Parerg. p. 327) to his 
Microglena (Thelenella, Nyl.) the two muscicoline lichens being rather 
remarkably distinguished from the other; and only in fact related to the 
present group (Segestria) from which they afford an evident passage into 
Verrucaria, by the originally more or less coloured and softish perithecia. 
The elegant Verr. leucothelia, Nyl. (Fellm. Lich. Arct. n. 219) belongs 
however to the same cluster with his V. sphinctrinoides ; and sheds 
important light on the true affinity of the last. 
But two lichens referable to Segestria have been observed as yet in 
North America. S. lectissima, Fr., so far at least as all the other charac- 
ters go, but with the longer 7-10-locular spores ascribed by Koerber to 
his 8. Ahlesiana (Parerg. p. 324) has occurred to me once on granitic 
rocks near water in the White Mountains. —_S. nucula, Fr. (Porina, 
Ach.) is found on various barks in South Carolina (Mr. Ravenel) and in 
southern Alabama (Mr. Beaumont). 
LXIV.—STAUROTHELE, Norm. 
Staurothele, Norm. Con. p. 22, t.23,b,¢. Th. Fr. Lich. Arct. p. 263; Gen. 
p.107. Verrucarie sp., & Pyrenule sp., Ach. L. U. pp. 51, 64; Syn. p. 
120. Verrucarie sp., & Sagedie sp., Fr. L. E. pp. 415, 441. Verrucarize 
sp. Wallr. Fl. Crrpt. Germ. 1, p. 308. Nyl. Pyrenoc. p. 21; Lich. 
Scand. p. 269. Verrucariz & Lecanore spp., Scher. Spicil. pp. 336, 429. 
Endocarpi sp., Leight. Brit. Ang. Lich. p. 19, t. 6, f.1,2. Lénnr. in 
Flora, 1852. Stizenb. Beitr. 1. c. p. 150. Paraphysorma, Mass. Ric. 
p. 116. Thelotrematis sp., Neg. & Hepp in Hepp Flecht. Eur. t. 2. 
Anz. Catal. Sondr. p. 104. Sphzromphale pro p., & Stigmatomma, 
Koerb. Syst. p. 3835; Parerg. p. 329. 
Apothecia verrucis thallinis immersa, perithecio nigricante, amphi- 
thecio pallido, paraphysibus diffusis. Spore ellipsoide, muriformi- 
multiloculares, fuscescentes. Spermatia haud visa.” Thallus crus- 
taceus, effiguratus 1. uniformis. 
1 Thelenella eminentior, Nyl. Exp. Lich. Nor. Caled., a bark-lichen, of which 
the author says ‘ faciem proxime habet Ferrucarie nucule’ (Segestria nucula, Fr.) 
should seem to confirm this; and as well the reference to Segestria of the tropical 
species of Porina, Mass.; the published character of the New Caledonian lichen 
offering no differences from the latter trpe, except that the ‘fusiform-oblong’ spores 
exhibit the muriform configuration.—In a later work (Syn. Lich. N. Caled. p. 86) 
received since the above was written, Dr. Nylander refers the cited Thelenella to 
the neighbourhood of Segestria nucula, in his Verrucaria. 
2 My friend Mr. Willey writes however that in a recent examination of the 
apothecia of Staurothele diffractella, during which he had submitted “the nucleus, 
