132 Rev. W. A. Leighton on new British Lichens. 



and shining. It should be remarked^, that De Notaris (Giorn. 

 Bot. Ital. an. 2. 1. 316) says of C. nigricans, Fries^ "sporidiis 

 ellipticis," and Eresenius (in BayrhoiFer Uebersicht, p. 93), 

 " Sporen einfach, zuweilen in der Mitte mit einer verwachsenen 

 Querwand;^^ and Schserer (Enum. 174) describes the sporidia 

 as " sporfe simphces ;" but in Zwackh's and Sehserer's speci- 

 mens, cited above, I have found them distinctly uniseptate, 

 though with simple or indistinctly septate ones occasionally 

 intermixed. In Heppe, 157 ! they were chiefly all simple. 

 C. nigricans, Fries, moreover, has its habitat on trees, "ad 

 quercus ;" but C. citrina occurs only on stones. 



The only Calicium with stipitate apothecia that I know of, 

 which grows on stones or rocks, is C. corxjnellum, Ach., which I 

 have in my herbarium from Upsal ! Fries fil. ; Fontainebleau ! 

 Nyl. and Zwackh, 141 ! This, indeed, has a citrine pulverulent 

 thallus, but then the disk of the apothecium is of a deep raven- 

 black, surrounded by a thin prominent margin, and the stipes 

 of a paler but decided black and smooth. The sporidia also 

 are uniseptate and brown, but the extremities of the cells being 

 peculiarly pointed or cuspidate, give them an unmistakeable ap- 

 pearance, altogether different from the plain rounded extremities 

 of those of C. citrina, to say nothing of their difference in size 

 (see Plate VIII. fig. 19). Moreover, C. corynellum., Ach. is a true 

 Calicium with a carbonaceous excipulum, whilst C. citrina has 

 the excipulum pale, and not carbonaceous, — a structure better 

 described by comparison, as in the words of Dr. Nylander (Nouv. 

 Classif. cit. s.) " est genus Coniocybe, quoad apothecia, ad Cali- 

 cium, ut Biato7-a Fr. adLecideam Fr.; vix aliter invicem differunt." 



Of this Hchen I propose to give examples in the forthcoming 

 9th fasciculus of my ' Lichenes Britannici Exsiccati.' 



Plate YIII. fig. 7- Coniocybe citrina, Leight., nat. size. Fig. 8. Apothecium 

 of C. citrina, highly magnified. Fig. 9. Sporidia of C. citrina, 

 highly magnified. Fig. 10. Supposed apothecia of Biatora lu- 

 cida, Fries, nat. size. Fig. 11. The same, magnified. Fig. 12. 

 Vertical section of supposed apothecium of B. lucida. Fig. 13. 

 Supposed sporidia of B. lucida. Fig. 14. Sporidia of C. fur- 

 furacea, Ach., and its varieties. Fig. 16. Sporidia of C. gra- 

 cilenta, Ach. Fig. 16. Sporidia of C. pallida, Fries, and its 

 varieties; and of C. farinacea, Chev. Fig. 17- Sporidia of C. 

 hyalinella, Nyl. Fig. 18. Sporidia of C. nigricans, Fries. Fig. 

 19. Sporidia of Calicium corynellum, Ach. Fig. 25. Scale of 

 magnitude of the sporidia only. 



Sphinctrina septata, Leight. Apothecia parasitic, stipitate, 

 dark brown ; stipes short, stout and smooth ; excipulum clavato- 

 pyriform, truncate, incurved at the margin; disk depressed, 

 dark brown ; sporidia in asci, eight, very large, elliptical, 3- 

 septate, umber-colour; cells granular. 

 Sphinctrina septata, Leight. Lich. Brit. Exs. 228! (1856). 



