34 
5. On Lecanora tartarea, Ach. 
(a) Var. frigida, Sm. “ Highlands of Scotland, 1807,” in 
the Kew Herbarium. The parasite has the characters of a 
Lecidea, and is probably referable to L. parasitica, Flk. 
(Nyl. Prodr., p. 144). The apothecia are small, black, 
thin, with a wavy outline. The paraphyses are indistinct in 
their filaments, with, however, very dark brown tips. The 
asci are 0010” to :0013” long, and -00033” to -00050” broad. 
Thesporidia are 2—4-locular, brown, ‘0004” long, and 00014” 
broad. L. parasitica is better known on the continent, as it 
occurs on the thallus of various Pertusarie: but it also 
grows on Lecanora parella,andon L. Turneri,Ach.,which is now 
generally assigned, as Nylander assigns it (Prod., p. 85), to L. 
tartarea. Its sporidia are described as 8 in each ascus, small, 
oblong-cylindrical, or narrowly ellipsoid, sometimes curved, 4- 
sometimes 2-locular, brown. Evidently closely allied to L. 
parasitica,if they are not all referable to a single type, are the 
parasitic Buellia urceolata and B. convexa of Th. Fries (L. 
Arct., pp. 233-4, and L. Spitsberg, p. 45) : and the various 
species of Massalongo’s genus Leciographa, as given in Kor- 
ber’s Parerga (p. 463) eg. L. Neesii, Fw., and L. parasitica, 
Mass. 
(0) Igloolik ; collected during Sir Edward Parry’s polar 
expedition in 1823 : inthe Kew Herbarium. Parasite bluish- 
black, very irregular in form and size, seldom round in out- 
line, generally angulose or radiate: crowning the thalline 
warts, semi-immersed there. There is no definite struc- 
ture; but it differs apparently in its characters from any of 
the Greenland parasites on the same Lichen, as I have 
examined and described them.! 
(c) Morchone, Braemar ; collected by myself in August, 
1856. Parasite very minute, black, punctiform, scattered on 
the pale glaucous surface of wartlike deformities of the thallus, 
and on the tumid margins of the apothecia; with difficulty 
seen, from its extreme minuteness, even under the lens.” It 
exhibits, however, no normal structure. 
I have occasionally found Coniothecium lichenicolum, Linds.,* 
parasitic on the sterile thallus of Z. tartarea, eg. on an 
isidioid state, collected on Morchone, Braemar, in August, 
1856, and on another specimen collected during the same 
excursion and month on Scuir-na-gillean, Skye. The 
reproductive structwre of this fungus readily distinguishes 
1 “ Observations on W. Greenland Lichens,” p. 342-4. 
2 Ibid., p. 366, plate |, fig. 3. 
8 “New Lichenicolous Micro-Fungi,” pp, 518 and 584. 
