DR LAUDER LINDSAY ON NEW LICHENICOLOUS MICRO-FUNGI. 541 



Both thallus (of the host) and disks of the parasite closely resemble those of 

 Barmouth (North Wales) specimens of C. lichenicolum. 



(c) Lecanora cenisia, Ach. (which = var. atrynea, Ach., of Lecanora sicbfusca, 

 Ach. according to Nylander) from Ayton, Cleveland, Yorkshire, Mudd, in my 

 Herbarium, bears on its apothecia a minute punctiform parasite, containing solea- 

 form sporidia ; here, however, of a pale, brownish-yellow hue. 



id) On thallus of Lecidea packycdrpa, Duf., Ireland, Admiral Jones, June 

 1858. Parasite is small, black, and Lecidioid, resembling certain lichen-spermo- 

 gonia of the flat, discoid type. Hymenium gives no blue with iodine. Paraphyses 

 filiform, indistinct, wavy, not coloured at tips ; asci 0040'' long, '00083'' broad ; 

 sporidia colourless when young, gradually acquiring an olive or brown tint with 

 age; soleaform ; 00066'' to -0010'' long, -00033" broad. 



It is impossible to confound the perithecia or sporidia of the parasite with the 

 apothecia or sporidia of the Lecidea. The apothecia in question are very large 

 and conspicuous; while the sporidia of the Lecidea are also very large — -0040" 

 long, and -00133'' broad ; 7-septate, colourless, oval-oblong. The asci of the 

 Lecidea are, moreover, 1-spored, 0050'' long, 0014" broad, becoming pale blue 

 with iodine. Its paraphyses are indistinct ; obscured about their irregular tips 

 by much granular, greenish pigment-matter, and throughout the length of their 

 bodies by the same colouring matter (in quantity), and by oil globules. 



6. M. Stictaria, Parasitic on thallus of Sticta Freycinetii, Del., Campbell's 

 Island, Dr Hooker, Antarctic Expedition (sub-nom. S. scrobiculata). The con- 

 ceptacles of the parasite are small, black, and superficial, easily detached. Asci 

 8-spored, small, subsaccate, deep violet with iodine. This is, at least, an unusual 

 reaction if the plant is a fungus ; while it does not appear to possess other 

 characters of a lichen ! Sporidia brown, soleaform (1 -septate),* resembling those 

 of M. rugulosaria, but much smaller. 



7. M. parietinaria. Parasitic on thallus of Physcia parieiina, L., Cottishall, 

 in Herb. Kew ; on a single fragment of the Physcia. Parasite occurs as minute, 

 black perithecia, variously punctiform or papillseform according very much to 

 size ; partly immersed ; much crowded on the thallus of the host ; variously 

 resembling lichen-spermogonia {e.g. of some Lecidea?), or the smaller Verrucariw. 

 Asci not seen; sporidia brown, 1-septate, -0005" long, '00016" broad; soleaform 

 as in M. Stictaria and M. rugulosaria ; nearly of same size as those of latter, 

 but larger considerably than those of former. M. parietinaria must not be con- 

 founded with Phacopsis varia, Tul. (Mem., p. 125, tab. 14, figs. 1-3 ; Celidium, 

 Korb., Parerga, p. 456), which has 3-septate, ellipsoid, colourless sporidia, 

 according to Tulasne ; but oblong and becoming brown, according to Korber. 



8. M . Bwomycearia. Parasitic on sterile thallus of Bceomyces rufus, DC, Bal- 



* Frequently erroneously written solceform. Soleaform sporidia are necessarily 1-septate. Vide 

 definition of the term in " Otago Lich. and Fungi," foot note, p. 447. 



VOL. XXV. PART II. 7 A 



