DR LAUDER LINDSAY ON NEW LICHENICOLOUS MICRO-FUNGI. 545 



Mar. 1858. — Perithecia are black and punctiform, containing in great numbers 

 corpuscles that are -00025 "long, and 000066" broad; simple, or sometimes faintly 

 1-septate, brown, linear or ellipsoid-oblong, frequently somewhat constricted 

 centrally. Neither asci nor basidia were visible, and the corpuscles above 

 described may therefore be either sporidia or stylospores. 



8. The horizontal squamules (and, to a less extent, the scales of the podetia 

 from base to apex) of a specimen of Cladonia bellidiflora, Ach., collected on Kelly's 

 Green, Ireland, by Dr Moore, Aug. 1853, in Herb. Carroll, (Linds. Mem. Spermog. 

 p. 163), bear, copiously scattered, a parasite, which has certain of the characters of 

 Nylander's Lecidea Cladoniaria* (Enum. Gener., Suppl. p. 339). His description, 

 however, is imperfect, e.g., as regards the sporidia, which, he hints, may some- 

 times be normally brown. In the Irish plant, the sporidia are eight in each ascus, 

 arranged in one series; ellipsoid, simple, and colourless, -00033" long, -000111" 

 broad; asci elongated, -00166" long, -00033'' broad; paraphyses with discrete 

 tips, but colourless, and not thickened. With apothecia, having externally the 

 characters partly of those of AbrothaUus Smithii, partly of A. oxysporus, are 

 associated Pycnidia, containing stylospores precisely of the characters of the 

 sporidia as respects size, form, colour, and 'structure, -00033" long, -00014" broad. 

 Externally, however, these pycnidia are always brown. In my "Memoir on 

 Spermogones and Pycnides," I have described them as spermogones ; but their con- 

 tained corpuscles have rather the characters of stylospores.} The apothecia have 

 a convex surface in maturity; seldom sessile, and equally seldom altogether 

 immersed; the body or bulk being generally immersed, and the surface nearly on 

 the same level as the thallus of the host. They are discoid ; black throughout ; 

 and their section resembles that of a double convex lens. In the young state they 

 appear as minute, black papillae, emergent from the thallus ; in which condition 

 they are apt to be confounded with the pycnidia. 



In my "Memoir on Spermogones," I have mentioned this parasite under the head 

 of Nylander's Lecidea Cladoniaria; to which I have also provisionally referred a 

 commoner parasite on Cladonia uncialis, Hffm. (p. 285, plate vii. figs. 14-16). 

 But the stylospores of the latter parasite are not the same as those of the para- 

 site on C. bellidiflora ; and, indeed, the two parasites seem distinct in several 

 essential respects. Nor does Nylander mention either spermogonia or pycnidia as 

 possessed by his plant. While, then, it is possible that one or other of the parasites 

 in question is referable to Nylander's plant, it is equally likely they are hitherto 

 undescribed. Should this prove to be the case, I propose for that which affects 



* It may also he compared with his Lecidea oxysporella (Prod. 145), which grows on the thallus 

 of C. digitata on the Spliigen; and with Lecidea Cetraricola, Linds. (" Lichenicolous Micro-Lichens,'' 

 Quart. Journal of Microscopical Science, Jan. 1869). 



f I have pointed out the anatomical or morphological distinction hetween stylospores and sj.er- 

 matia in my paper on "Polymorphism in the Fructification of Lichens " (antea citat.). 



VOL. XXV. PART II. 7 B 



