Bd. IV: II) THE LICHENS. 9 



Caloplaca athallina nov. spec. 



(Plate 2, fig. 14.) 



Thallus obsoletus; apothecia solitaria aut quasi contigua, flavescentia, margine 

 instructa pallidiori, ad 1.1 mm lata, K sanguineo-rubescens; parathecium et hypo- 

 thecium decolor; sporae octonae, hyalinae, polari-bicellulares, 10 — 12x7 — 9,11 magnae; 

 spermogonia nulla visa; habitat ad muscos vetustiores, Graham Land, Pau let Island. 



Notes: This species, apart from its habitat, is characterised by a practically 

 complete absence of any thallus. The spores are rather small, and the apothecia 

 stand up fairly high from the moss plants on which the plant grows. 



Lecanora mons-nivis nov. spec. 



(Plate 2, fig. 15.) 



Thallus nullus aut tenuissimus, albido-flavescens, granuloso-crustaceus, saepius 

 apotheciis solis constructus, K — ; apothecia dense disposita et saepius lineas de- 

 pressionis substrati occupantia, nigricantia, 0.5 — 1.0 mm lata, irregulariter difformia, 

 margine instructa pallidiori aut quasi albido et semper distincto; cpithecium pruino- 

 sum; parathecium et hypothecium hyalinum; paraphyses simplices, 2 — 3 /.i latae; 

 asci 86 — 15 f( magni; sporae octonae, hyalinae, uniceliulares, 12 — 14x5 — 7 /< magnae; 

 spermogonia nulla visa; habitat ad saxa, Graham Land, Seymour Island and Snow- 

 Hill Island. 



Notes: The most characteristic feature of this species which seems to be a very 

 common object on the sand stone collected at Snow Hill Island is that it does not 

 spread in all directions but mainly along the depressions in the surface of the sub- 

 stratum. Long rows up to i cm and more in length are met with, being simply 

 rows of apothecia, the row not being more than 1 mm in breadth, generally only 

 0.5 mm. This method of growth and the marked white margin of the fruit gives 

 the species a very distinctive appearance. The white margin (due to the amphi- 

 thecium) is of course more marked in the younger than the older apothecia. 



Lecanora Skottsbergii nov. spec. 



(Plate 2 fig. 16, 17.) 



Thallus bene evolutus, crassus, albidus, K flavescens, profunde rimoso-areolatus 

 et diffractus, margine in lacinias ecurrenti bene sed minute areolato-diffracto aut 

 quasi granuloso-tuberculato-diffracto, hypothallo instructus nigro sed non bene viso; 

 apothecia rotundata, nigra, ad 3 mm lata, primitus urceolata, deinde elevata, aperta, 



2 — 112865. Schwedische Südpolar- Expedition igoi — iqoj. 



