8 0. V. DARBISHIRE. 
longae, et -004—'007 mm. latae; spermogonia thallo immersa, irregulariter cavernosa ; 
spermatia cylindrica, ad -004 mm. longa. Habitat ad saxa vulcanica. 
Notes.—This new species is, I think, undoubtedly a species of Buellia, but in its 
earlier stages the apothecium not unfrequently is partially lecanorine. The plant thus 
comes near to Rinodina. The hypothecium is often carbonaceous, especially near the 
margin of the fruit; but, of course, Buellia and Rinodina are very closely related to 
one another. 
BUELLIA PARASEMA. 
Buellia parasema (Ach.) Th. Fr. Th. Fries, Lich. Scand., p. 589. 
Locality.—Winter Harbour, December 15th, 1903, over moss on earth. 
Notes.—The specimens consisted of small fragments only. This species is known 
from arctic America and Europe. 
BUELLIA QUERCINA. 
(Plate I., fig. 3.) 
Locality.—Probably from Granite Harbour, McMurdo Bay, January 20th, 1902, 
on dark basic lava. 
Diagnosis —Crusta tenuis, cinerascens, regulariter rimoso-diffracta, margine 
pallidiori, ambitu effigurato (Catolechiae speciei similis), continua; apothecia primum 
thallo, immersa, dein emergentia, elevata et quasi stipitata, immarginata ; epithecium 
et parathecium carbonaceum ; hypothecium fuscescens; amphithecium nullum ; sporae 
octonae, fuscae, bicellulares, ‘012-014 mm. longae, ‘0076 mm. latae. Habitat ad 
saxa vulcanica. 
Notes.—This species shows a very well-marked etligurate margin, but the thallus 
as a whole is so thin that I think it is only a species of Buellia. The thallus is 
rimoso-diffract, and the young immersed apothecia recall some species of Aspicilia. 
It is very closely applied to the very rugged surface of the substratum. Only one 
specimen, measuring about 6 by 4 mm., was found. uwellia quercina is lighter in 
colour than Buellia frigida, and its margin is more clearly effigurate. The interrupted 
thallus of the latter, forming often small patches barely -5 mm. in diameter, is another 
important external difference. 
PHYSCIA CAESIA. 
Physcia caesia (Hffm.) Nyl. Th. Fries, Lich. Scand., p. 140. 
Localities.—Granite Harbour, McMurdo Bay, January 20th, 1902, on granite. 
Winter Harbour, December 15th, 1903, over moss and possibly basis scoriaceous lava. 
Notes.—The material from the latter locality is I think again open to doubt, 
especially that specimen which has the lava as its substratum. This species is 
cosmopolitan. It is recorded from the Antarctic by MM. Wainio (Belgica, p. 24), 
Hue (Charcot, no. 11), and Vanhoeffen (German Antarctic). 
s 
