6 0. V. DARBISHIRB. 



Notes. This new species was found in the smallest interstices of lava. The 

 specimens are hardly visible, and they owe their discovery to the presence of a yellow 

 lichen, which has however remained undetermined. The thallus consists mainly of a 

 few granular masses of sterile tissue containing gonidia, which are overshadowed by 

 the apothecia which are almost stalked. These act also as assimilators, as they possess 

 a dense layer of gonidia underneath the hypothecium. 



LECANORA POLYTROPA. 



Lecanora polytropa (Ehrh.) Nyl. Th. Fries, Lich. Scand., p. 259. 



Localities. Granite Harbour, January 20th, 1902, on dark basic tuff. Summit 

 of Observation Hill, Winter Harbour, December 27th, 1902, on light, acid volcanic ash. 



Notes. The specimens from Observation Hill are just a bit doubtful. This 

 species is almost cosmopolitan, and has been recorded from the Antarctic by M. Wainio 

 (Belgica, p. 19). 



LECANORA SUBFUSCA. 



Lecanora subfusca (L.) Ach. Th. Fries, Lich. Scand., p. 238. 



Locality. " Lichen from ridge of West Mountains at highest point we reached, 

 5000 feet, December 15th, 1902, Western Sledge Journey, collected by Skelton," 

 on granite. 



Notes. I am not at all certain that the specimens before me really belong to 

 Lecanora subfusca. The material from this locality included some lichens that were 

 quite indeterminable. It is however of first importance to find lichens at all in such 

 a locality. The species is widely distributed and almost cosmopolitan. 



PARHELIA QUARTA. 

 (Plate I., fig. 5.) 



Locality. Granite Harbour, McMurdo Bay, January 20th, 1902, on dark basic 

 volcanic ash. 



Diagnosis. Thallus 5-10 mm. latus, 3-4 mm. altus, peltatus-affixus, convolutus, 

 superne apotheciis nigricans vel coeruleo-nigricans, sed partibus apotheciis destitutus et 

 margine pallidior, inferne pallidior nudus et albidus, superne et inferne plentenchy- 

 matice corticatus ; medulla laxe stupposa, sed ad umbilicum firma ; gonidia proto- 

 coccoidea ; apothecia parmeleina ; epithecium coeruleo-nigricans ; parathecium decolor ; 

 hypothecium decolor sed gonidiis instructum numerosis ; asci ventricosi ; sporae 

 4-8nae, hyalinae, simplices, octonae, "0075- -008 mm. longae et "0065- "0075 mm. 

 latae, quaternae, "010 mm. longae et "0075 mm. latae. Habitat ad saxa vulcanica. 



Notes. I think there can be no doubt that this is a new species, and that it 

 belongs to Parmelm. The well-developed cortex above and below separate it from 

 any species of Squamaria. The cortex in each case consists of branching cell-rows 



