FRESHWATER ALGJE. 



C. subcaudat/i Wille) and Chloromonas (i//>iim Wille, arc, however, as yet only 

 known to occur in the Antarctic and in the north of Europe, although it is 

 hardly likely that future investigation will fail to reveal their occurrence in 

 intermediate regions. 



Another interesting case of distribution is that of species like 6'///////"//<^ 

 itlftina Wille, and the genus Eucapsis, which have hitherto only been recorded 

 from alpine habitats. Parallel cases have long been known in the Arctic regions. 



The collections of the ' Discovery ' did not include any material of snow floras. 

 On the other hand, two samples (Cape Aclare, January 9th, 1902 ; McMurdo Bay, 

 September 13th, 1902) came from the ice. It will be useful to give a list of the 

 commoner species found in these two habitats : 



CAPE ADABE (in freshwater ice under boulder). 



McMuKDO BAY (dull brick coloured ice). 



Chloromonas alpina Wille. 

 Eucapsis mini/ta sp. n. 

 Navicula mutiropsis Van Heurck. 



cymatopleura W. and G. S. West. 



semi/i tihint (Iran. 

 Surirdla any list a Kiitz. 



Mlcroeyxlls jmrasitira Kiitz. var. glariulis var. u. 



parasitica Kiitz. 



merismopedioides F. E. Frilsrli. 

 Phormidium frigidum sp. n. 



*Pli'ttnii-iifi-iix antarticus W. ami G. S. West. 



dissertus Niig. 



*Nostoc dixciforme sp. n. 

 *Melosira sp. (cf. p. 4G). 

 Fragilnria tftnticollis Heib. var. anlartiea W. and 



G. S. West. 

 Nai'icula semi/uilton Grun. 



mitticopxis Van Hcmvk. 

 ,, eymatoiilmrus W. and G. S. \Vest. 

 shacMetoni W. and G. S. West. 

 i/lnl>ii-ej)s Greg. 



The colour of the ice in the second case was due to Mwrocystis para* if/*;/ 

 Kiitz. var. glacialis uov. var. Tlie species marked with an asterisk did not grow 

 directly on the ice, but were epiphytes on the Phormidium. 



As above mentioned, the bulk of the material collected by the members of 

 the British National Antarctic Expedition consisted of Phormidium-sbieetB with their 

 abundant epiphytic flora. The general character of this flora is sufficiently illustrated 

 by the Table on p. 4. Only a few .samples comprised free-floating forms, the more 

 important of which were as follows : 



Chlamydomonas x/i/n-/i//<//ttti Wille. 



intcrmeilia Chod. 



,, ehrenbergi Gorosch. 



T0rmttftvm -stage and young packets of 



Pi-ilium sp. (rf. pp. 20, 21). 

 Microcystis manjiiui'/i (ilenegh.) Kiitz. 

 Mi'i'isniiijii'ilin tein/ixsinia Leimn. 

 Eucnpsis mi/iitta sp. n. 

 Phormidium antarcticum W. ami U.S. 



Oscil//i/,ifiu li-niiix Ag. and other speeies. 

 Nostoc ilim-iYni-iiii' sp. n. 

 longxtaffi sp. n. 

 fiiscescens sp. n. 

 s/ihiirii-i/m VaucL. 

 Xoilularia quadrala sp. n. 



miitifti/isis Van Ilenrck. 

 ulobii't'ps Greg. 



shackletoni W. and G. S. West. 

 i-i/i/iiit<i/>li'itriis W. and (I. S. \\Yst. 



