8 0. V. DAKBISHIRE. 



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 L, fig. 3.) 



Locality. Probably from Granite Harbour, McMurdo Bay, January 20th, 1902, 

 on dark basic lava. 



Diagnosis. Crusta tenuis, cinerasceus, 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 ; hypotheeium 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 etiigurate 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 cl6sely applied to the very rugged surface of the substratum. Only one 

 specimen, measuring about 6 by 4 mm., was found. Buellia 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). 



