DR. LINDSAY ON WEST-GREENLAND LICHENS. 327 
This parasite does not correspond in charaeter with any of the following parasitic 
Lichens, which affect species of Solorina or Peltigera, viz. :— 
1. Ehagadostoma corrugatum, Korb. (* Parerga,’ p. 472), which is parasitic on S. erocea. 
Sporidia 2 to 4, large, hyaline, simple or 2-locular, clavate. 
2. Scutula Krempelhuberi, Körb. (* Parerga, p. 455), which is parasitic on S. saccata. 
Sporidia 8, minute, ellipsoid, simple or 2-locular, hyaline. 
3. Xenospheria Engeliana, Saut. (Körb. * Parerga,’ pp. 466 & 307; and ‘Systema,’ 
p. 376), also parasitic on S. saccata. Sporidia 6 to 8, arcuate-ellipsoid, 4-locular, brown. 
4. Biatorina tuberculosa, Th. Fries. (L. Arctoi, p. 188), a parasite on Peltigera. 
Sporidia fusiform-oblong, 2-locular, colourless *. 
Nor is the parasite on the Greenland plant what I have described as infesting Irish 
specimens f of S. crocea, where it consists of mere pycnidia ; while it does not agree with 
the Spheria urceolata of Solorina saccata t, which has brown sporidia. 
In sterile specimens of S. crocea, in Herb. Kew., from Lachen, Sikkim-Himalaya, alt. 
12,000 feet, collected by Dr. Hooker, the thallus, especially about its periphery, is studded 
over with a parasite in the form of crowded, black papillæ or points, sometimes semi- 
immersed. It contains deep brown, soleæform (2-locular) sporidia :0010”. long and 
00025” broad. This, again, differs in character from all the other parasites above men- 
tioned on Solorina or Peltigera. 
On S. crocea, which I collected on the top of Ben Lawers, in June 1856, a black papillæ- 
form parasite occurs, occupying cushion-like elevations of the thallus, closely studded 
over these pulvinuli, rendering them very rugged and black-warted. These cushion-like 
deformities are usually seated at the division-angles of the lobes. The individual con- 
ceptacles are semiimmersed in the thallus. No distinet structure can be detected: no 
blue reaction is developed with iodine; no asci were seen; but a large number of oil- 
globules of all sizes covered the field of the mieroscope. Externally the parasite differs 
from that on S. saccata, assigned to Spheria urceolata, in the crowding or agglomeration 
of the perithecia into warts. The Ben-Lawers parasite has the same external characters 
as that from Brandon Mountain, Kerry (Carroll), in which the stylospores are oblong or 
oblong-ellipsoid, colourless, simple, or 2-locular, muco-granular in the young state; 
00133” to 00166” long and 00033" broad. But the want of structure in the Ben-Lawers 
plant leaves us at a loss as to the species or genus, lichen or fungus, to which it is to be 
assigned. Possibly the parasitic pyenidia of the Irish plant are referable to some of 
the sporidiiferous lichens or fungi already mentioned as affecting S. crocea or S. saccata. 
Gen. 14. Srrcra. 
1. S. pulmonaria, L. Not in the present collection, and not given at all by Th. Fries as- 
a Greenland lichen. But in the Kew Herb. I saw specimens of the ordinary form labelled 
“ Davis Straits." The labels, however, unfortunately did not inform us on which coast 
* lhave no means of judging whether any of the parasites I have met with on S. erocea, in Greenland or other 
specimens, bear any relation to Bertia lichenicola, De Not., a parasitic fungus, according to Rabenhorst (‘ Fungi 
Europ. Exs. Cent. x.), that affects its thallus. 
t Mem. Spermog. p. 175. t lbid. p. 175, and pl. ix. fig. 35. 
