143 
he found in Hepp’s plant as simple and hyaline and the 
plant itself as referable to Borrer’s Endocarpon psoromoides. 
The spores of the latter, as represented by Leighton (Brit. 
Angioc. Lichens, pi. ii, fig. 4), are 4-locular and brown ; 
which spores Hepp refers to a parasitic Sphceria (<S. urceolata, 
Schaer. == Xenosp/ueria Engeliuna. (q. v.) 
In Hepp’s plant I found two different forms of spore — 
the one colourless, becoming sometimes brown, 2-locular or 
simple ; the other brown and 4-locular, becoming submuri- 
form. The latter spores are doubtless referable to the parasitic 
Xenosp/ueria, whose perithecia are scarcely distinguishable 
from the associated, very minute, black, verrucarioid spermo- 
gonia, which are full of atomic, spherical spermatia. The 
hymenium of the Xenosp/ueria gives no blue reaction with 
iodine. The paraphyses are obscure, nor could I distinctly 
make out the thecse. The spores of the Phacopsis resemble 
those of Celidium Pelvetii, being narrowly ellipsoid or fusi- 
form, colourless, simple, becoming 2-locular in age, some- 
times soleaform and brown, as in Abrothallus Stnithii ; the 
soleaform character being best developed under iodine ; 
•00045" long and •00015" broad. 
Genus IX. — Arthoxia, Ach., pr. p. 
Species 1. A. varians, Dav. (Nyl., Scand., 260). 
Syn. A. glaucomaria, Nyl., Prod., 168 ; Syn. Arthon ., 
98. Leight., Ann. Nat. Hist., Oct., 1856; 
Exs. 247. 
A. parasemoules, Nyl., Prod., 168 ; Mudd, 251. 
Celidium grumosum, Korb., Par., 457. 
,, sordidum, Anzi. 
„ varians, Arnold. 
Lecanoru glaucoma, v. varians, Ach. 
L. lainea, Ach. 
L. rimata, v. orbata, Schoer. 
Biatora verrucarioides, Hepp. 
Conida sordida, Mass. 
Sphceria Lichenis sordidi, Mass., Rich., 4. * 
On apothecia and sometimes thallus of Lecanora glaucoma , 1 2 
L. subfusca, and Lecidea parasema (Nyl., Scand. ; and Prod., 
1(58). On thallus of Physcia parietina and various Lecanora; 
(Nyl., Prod.) ; on apothecia of Lecanora cenisea, Ach. (= var. 
atrynea, Ach., of L. subfusca ), Mudd, in my herbarium 
1 Fries describes the sporidia as simple, hyaline, and endocarpoid. 
8 Associated sometimes with Lecidea rjlaucornaria (q. v.). 
