26 DISCOVERY REPORTS 



Section Entosthelia (Wallroth) Stizenberger 



Dermatocarpon intestiniforme (Korber) Hasse (Fig. i o) 



1912, p. 46. 



Endocarpon intestiniforme Korber, 1859-65, p. 42. 



Dermatocarpon fliiviatile var. decipiens f. intestiniformis Vainio, 1921, p. 13. 

 ' Lichen polyphylhis' in Wulfen, 1788, p. 142 (non Linnaeus). 



Dermatocarpon polyphyllum Dalla Torre and Sarnthein, 1902, p. 504; Zsciiacke, 1934, p. 627; Magnusson, 1934, 

 p. 458; Lynge, 1938, p. 33. 

 East Graham Land. James Ross Island: The Naze; altitude c. 20 m., in a damp shaded overhung 

 crevice in side of agglomerate rock, north-west exposure; F.I.D.S., 26. xi. 1945 (no. 2784). 



About 30 thalli, varying in size from i to 3 cm. in diameter, were present in the hollow of the rock. 

 They are of the polyphyllous-complicate type, with the lobes mostly convex with downrolled edges. 

 Upper side dull brown, but for the most part covered with a fine caesious-whitish pruina; under side 

 yellowish flesh-coloured to brown, ± wrinkled but not distinctly veined. The thallus does not become 

 green when wetted. Nearly all the individuals were fertile, but spores were rather sparingly developed, 

 IO-5-I2-OX 5-o-7-5/<, averaging 11-5 x 6-3//. 



This species and D. miniatum (L.) Mann (var. complicatum (Lightf.) Hellb.) are very similar and 

 rather difficult to separate on morphological features. The chief difference is supposed to lie in the 

 spores, which in D. mimatam are somewhat longer, 8-14//, or even up to 20//, according to Lynge 

 (1938, p. 34). The average length/breadth coefficient is about 1-5 in D. intestiniforme and 2-0 in D. 

 miniatum (Lamb, 1940, p. 267). In the exsiccat Korber, Lich. sel. German, no. 397, which is authentic 

 material of D. intestiniforme, I found spores 8-5-io-5 x 5-0-6-5// with an average length/breadth 

 coefficient of i-6-i7. In the Antarctic material the coefficient works out at i-8. Apparently therefore 

 the difference in spore shape is not a very constant or reliable character, as in both species it fluctuates 

 within rather wide limits. D. intestiniforme has a rather typical growth form, implied in the name, and 

 noted by Santesson (apud Lynge, 1938, p. 34); the edges of the lobes are mostly rolled dowTiwards: 

 ' sehr auffallend sind die darmformig verschlungenen, zur convexen Areolenform eingerollten mittleren 

 Lappen,doch auch im Umfange ist der Thallus bei aller Verflachung wenigstens an den Randern meist 

 noch eingeroUt' (Korber, loc. cit.). 



The specific epithet polyphyllum (Wulfen) cannot be used for this species, because Wulfen (loc. cit.) 

 refers to Lichen polyphyllus Linn., which is Umbilicaria polyphylla (L.) Hoffm. 



Geographical Distribution. A bipolar species, new to the southern hemisphere; it occurs in 

 central Europe (where it is alpine), Scandinavia, Iceland and the Arctic (Spitsbergen, Novaya Zemlya, 

 Greenland, Arctic Canada). Lynge (1938, p. 33) has found Dermatocarpon intestiniforme to be a more 

 northern species than D. miniatum, which it almost replaces in the Arctic. It has also been recorded 

 from U.S.A. : Arizona and California. 



Darbishire, 1910, p. 9, recorded an unnamed species of the genus Endocarpon from South Victoria 

 Land: McMurdo Sound, Granite Harbour, collected by the British National Antarctic Expedition of 

 1901-4. The rock specimen referred to is preserved at the British Museum (Natural History), but no 

 Pyrenocarp lichen appears to be now present on it. 



