142 
On thallus of Lecidea rheetica (Hepp), L. petrcca, and 
Lecanora glaucoma. 
Tulasne (Mem., 125) mentions a Celidium as black-mottling 
Placodium albescens and Squamaria saxicola. Should this 
differ from the other so-called species, it may appropriately 
stand provisionally as — 
C. squarnariicolum. 
C. muscigenum, Anzi, Symb. I have not 
seen Anzi’s work, and do not know on what (if any) Lichen 
this species is parasitic. Nor do I know what is his C. varians, 
Dav. Korher, in his f Parerga ’ (457), includes it in his 
Celidium grumosum , which is a synonym of Arthonia varians, 
Nyl. (q. v.). 
Genus VII. — Conida, Mass ; Korb., Par., 458. 
Species 1. C. clemens, Tub, Mem., 124. 
Syn. Phacopsis, Tul. 
Arthonia, Th. Fr., Spitsb., 46. 
Conida apotheciorum, Mass. 
Sphceria, Mass. 
Placodium Goppertianum, Korb., Par., 458. 
On the apothecia of Squamaria saxicola, S. chrysoleuca, 
Placodium albescens, Hfftn., and P. murorum, Ilffm. 
Spores 8, small, oblong, 2-locular, colourless. The para- 
site black-mottles the epithecium of S. chrysoleuca. Inter- 
mixed with the spermogonia of that Squamaria, on its thallus, 
other parasites occur, externally black (Nyl., Scand., 131). 
The ordinary spermogonia of S. chrysoleuca are described and 
figured in my “ Memoir on the Spermogonia and Pycnidia of 
the Higher Lichens ” (* Trans. Royal Society of Edinburgh,’ 
vol. xxii, 1859, p. 260, pi. xv, figs. 15 — 17). 
Genus VIII. — Phacopsis, Tul., Mem., 124. Linds., Hist. 
Brit. Lich., 318 ; N. Z. Licli. and Fungi, 446. 
Species 1. P. vulpina, Tul., Mem., 126. Hepp, 474; 
Linds., N. Z. Lich. and Fungi, 446. 
Syn. Evernia vulpina, var., Fr. ; Mass. 
On thallus of Evernia vulpina. 
Spores simple, oblong or ellipsoid, colourless. 
2. P . psoromoides , Hepp, 475 ; Korb., Par., 459. 
Syn. Endocarpon, Borr. ; Mudd, 267. 
Endopyrenium dcedaleum, Ivrmp. 
Dermatocarpon, Th. Fries, L. Arct. 255. 
On Lecanora mutabilis, Ach. Mudd describes the spores 
