35 
it, however, from the other more common parasites of L. 
tartarea. 
Leighton has recently recorded! the occurrence of a new 
Spheria, 8. tartaricola, Nyl., on the thallus of L. tartarea, 
or its var. pallescens, L., on Cader Idris, Wales. In Spitz- 
bergen the thallus of L. tartarea is infested by the parasitic 
Lecidea associata, Th. Fries (L. Spitsb., p. 42) which has 
simple, ellipsoid, or sub-globose, colourless sporidia. 
6. On Lecanora parella, Ach. 
In British specimens, on the sterile isidioid or variolarioid 
—more or less tartareous—thallus, I have frequently met 
with Coniothecium lichenicolum—more frequently than on L. 
tartarea. Thus it occurs in my Herbarium on specimens 
from Glen Dee and Morchone, Braemar, collected in August, 
1856, and from Blackcairn Hill, Fifeshire, collected in May, 
1858. On New Zealand forms of L. parella, Leighton re- 
cords the occurrence of Lecidea parasitica ; while in France 
its apothecia are sometimes the seat of Pseudographis 
elatina, Nyl. (Prod., p. 171).? 
7. On Lecanora cinerea, L. 
(a) Scuir-na-gillean (3200 feet), Skye, August, 1856. The 
parasite here appears to be Endococcus erraticus, Mass.* 
(Nyl. Scand., p. 288 = Microthelia pyymea, Korb., Mudd., 
p- 307). The hymenial gelatine becomes rose-coloured with 
iodine : the paraphyses are delicate, discrete, short, wavy, 
not coloured nor knobbed at tips: the asci 006” long, and 
‘00066’ to :0010” broad, saccate, as in Arthonia, not blue 
with iodine, myriad-spored: the sporidia broadly ellipsoid, 
2-locular, becoming figure-8-shaped, brown, °00025” long, 
and ‘00011” broad. ‘This Hndococcus occurs in Greenland 
and Spitzbergen, on various species of Placodium, Lecanora, 
and Lecidea.* 
(6) Leighton’s Exsiccati, No. 81 (in my copy), bears the 
parasitic Verrucaria gemmifera, Tayl. (Mudd., Brit. Lich., 
p. 307). It differs from Endococcus erraticus in its larger 
perithecia and sporidia, and in its asci being only 8-spored. 
In Leighton’s plant the asci became violet under iodine: 
1 © Annals of Nat. History,’ vol. xix, p. 408 ; and in the ‘Transactions of 
the Linnean Society,’ vol. xxvii, p. 159, and plate xxxv; the locality in the 
latter case being near Dolgelly, North Wales. © 
2 Another parasite, on L. purel/a, is mentioned among my “ New Licheni- 
colous Micro-Fungi,” p. 549. 
3 Vide “ Observations on W. Greenland Lichens,” p. 367, plate li, fig. 4. 
* Th. Fries, ‘L. Arct.,’ p. 275, and ‘ L. Spitsberg,’ p. 51. 
