8 O. V. DARBISniRE. 



longae, ct '004- "007 mm. latae ; spcrmogonia tliallo immersa, irregulariter cavernosa; 

 spermatia cylindrica, ad "004 mm. longa. Habitat ad .saxa vulcanica. 



Notes. — Thi.s new species is, I think, undoubtedly a species of Buellia, but in its 

 earlier stages the apothecium not unfrequcntly is partially lecanorinc. The plant tlius 

 comes near to Riiwdina. 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 parase.ma. 



Buellia parasema (Ach.) Th. Fr. Th. Fries, Lich. Scand., p. 589. 



Locality. — Winter Harbour, December 15th, l'J03, over moss on earth. 

 Noti'S. — The specimens consisted of small fragments only. This species is known 

 from arctic America and Europe. 



Bdellia quercina. 

 (Plate I., fig. 3.) 



Localif'/. — Probably from Granite Harbour, McMurdo Bay, January 20th, 1902, 

 on dark basic lava. 



Diaif)iosis. — Crusta tenuis, cinerascens, regulariter rirao.so-diffracta, margine 

 pallidiori, amlntu effigurato (Catolechiae speciei .similis), continua ; apothecia primum 

 thallo, immersa, deiu emcrgentia, elevata et quasi stipitata, immarginata ; epithecium 

 et paratheciura carbonaceum ; hypothecium fu.scescens ; amphithecium nullum ; .sporae 

 octonae, fuscae, bicellulares, •012-"014 mm. longae, '0070 mm. latao. Habitat ad 

 saxa vulcanica. 



AWt'.<f. — This .species shows a very well-marked ettigurate margin, but the tliallus 

 as a whole is so thin that I think it is only a species of Buellia. The thallus is 

 rimo.so-diffract, and the young immer.sed apothecia recall some species of Aspicilia. 

 It is very closelv applied to the very ruggdd surface of the .substratum. Only one 

 specimen, measuring al)out G by 4 mm., was found. Buellia quercimi is lighter in 

 colour than Budlia friijida, 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 diH'erence. 



Physcia caesia. 



Phijseia rtwsifi (Hffm.) Nyl. Tli. Fries. Lich. Scaiiil., p. 140. 



Localitie.^. — Granite Harbour, McMurdo Bay, January 20th, 1902, on granite. 

 Winter Harbour, December loth, 1903, over mo.ss 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 (Bclgica, p. 24), 

 Hue (Charcot, no. U), and Vanhoeffen (German Antarctic). 



