550 DR LAUDER LINDSAY ON NEW LICHENICOLOUS MICRO-FUNGI. 



hymenium — is most interesting in both an anatomical and physiological point of 

 view. I have met with the same phenomenon in several other fungi, e.g., that 

 described in this paper as associated with Verrucaria epidermidis. Parallel 

 phenomena are the co-existence of sporidia and spermatia or stylospores in the 

 same perithecia in Sphwria Lindsay ana^ Curr. (Linds. " Otago Lich. and Fungi," 

 p. 425, plate xxx. fig. 7) ; of sporidia and spermatia in Verrucaria atomaria, 

 Ach. (Linds. "On Polymorphism in the Fructification of Lichens," in Quart. Journal 

 of Microscopical Science, Jan. 1868) ; and of spermatia in the ordinary sporidii- 

 ferous perithecia of Verrucaria, by Gibelli (Annals of Nat. History, April 1866, 

 p. 270). 



25. Associated with Lecidea lurida, Ach., in Herb. Kew ; " sea rocks near 

 Bangor, July 1802." Thallus exhibits a number of spermogonia scattered about 

 the margins of its lobes as deep brown points, the body of the conceptacle be- 

 ing immersed in the thallus. Intermixed are the externally similar, but more 

 conoid, perithecia of the parasite, whose hymenium gives no blue with iodine. Asci 

 apparently polysporous ; -0020'' long, '00066'' broad. Sporidia fusiform or ellipsoid, 

 dark bottle-green or brown, irregularly 3-septate in maturity ; -0005'' to 00066" 

 long, 00014" broad. 



On the same sheet, and associated with L. lurida, are fastened specimens of 

 what appears to be the same lichen, labelled " No. 19, on rocks by the sea, Miss 

 Hutchins," from Ireland doubtless. In both, the apothecia are distinctly Lecan- 

 orine in the young state, possessing a thalline margin, and thus differing alto- 

 gether from the Lecidea. But their apothecia resemble those of L. lurida in 

 the old state, when the disk becomes sub-convex, and the thalline border dis- 

 appears, or is covered by the swollen disk. The disk in the Lecanorine apothecia 

 is usually of a lighter red than in L. lurida. In Miss Hutchins' plant the thallus 

 is much paler than in Bangor specimens. The colour of the thallus obviously 

 varies, just as it does in Physcia aquila, with its degree of exposure to light ; being 

 palest when the plant grows in the shaded crevices of rocks. In the Irish plant 

 the paryphyses are subdiscrete, with brown tips; the asci 8-spored, -00166" long, 

 0005" broad ; the sporidia ellipsoid, colourless, apparently 1-septate, '00033'' 

 long, 00014" broad. Probably the lichen in both the Bangor and Irish speci- 

 mens is Lecidea sublurida, Nyl. (Mudd. Brit. Lich. p. 172), which Mudd places in 

 the genus Thalloidima, Mass. 



26. Several parasitic fungi, or fungoid growths of the most diverse character, 

 affect the apothecia of Abrothallus Smithii, Tul., or are associated with its 

 pycnidia. But their apparent frequency in that lichen probably depends simply 

 on the greater amount of attention I gave to the examination of the pseudo- 

 genus Abrothallus while preparing my " Monograph" thereof* in 1856. 



* Quarterly Journal of Microscopical Science, vol. v. 1857. 



