124 BOTANICAL RESULTS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



Samples 1-3 (yellow snow !), fairly common. 



Probably nearly allied to T. reticularis (Reinscb), Hansg. For full consideration, 

 see p. 116. 



12. TROCHISCIA NIVALIS, Lagerh., Ber. Deutsch. Bot. Ges., x., 1892, p. 530, and 

 pi. xxviii., fig. 23 (PI. L, fig. 29). 



Sample 11, rare. 



The individuals were rather smaller than those described by Lagerheim (diam. 

 cell. = 10 M), but as in his form covered with very numerous minute spines; one (or 

 more ?) pyrenoids were visible in every case. There appear to be several chloroplasts. 



13. TROCHISCIA PACHYDERMA (Reinsch}, Hansg., Hedwigia, 1888, p. 128; Reinsch, 

 tjber Acanthococcus, Ber, Deutsch. Bot. Ges., 1886, p. 240, tab. xi., figs. 8-9. 



Samples 10 and 11, fairly common. 



SOENEDESMACE/E (seusu Oltmanns). 



14. OOCYSTIS LACUSTRIS, CJtod., Bull. HerUer Boissier, v., 1897, p. 296, and 

 pi. x., fig. 1-7. 



Forma nivalis, n. f. (PI. I., figs. 27, 28). 



Poli cellularum rotundati vel acuti ; in cellula aliquantum adipis flavi. Long. cell. = 

 13-15 n; lat. cell. = 9-10 M. 



Samples 1-3 (yellow snow !), rare. 



This form has been fully considered on pp. 112-113. 



15. OOCYSTIS SOLITARIA, Wittr. in Wittrock et Nordstedt, " Alg. aquae dulc. exsicc," 

 No. 244, Bot. Notiser, 1879, p. 24 and fig. 



Sample 11, rare. 



Cells ellipsoidal in shape, with rounded ends ; membrane moderately thick, with 

 apparently two layers, slightly thicker at the two ends of the cell ; cells generally 

 solitary, but now and again to the number of about eight within a mother-cell. Fat 

 generally present in the cell-contents. Length of cells = 16-20 M ; width = 13 M. 



16. CHODATELLA BREVISPINA, n. sp. (PI. I., figs. 25, 26; PI. II., phots. 3, 5. Gli). 

 Cellulse ellipsoideae plus minusve complaiiatae setis brevibus quae non amplius bis 



crassitudine membranse cellulae exstaut per totam superficiem externam confcrtae ; setae 

 plerumque tenues et angustae, interdum paulo crassiores, aequilongae ; inter ea quae 

 cellula continet semper est adeps, plerumque abundans, saepe similis duobus globis in 

 utroque fine cellulae. Long, cell. = 17-20 M ; lat. cell. = 10-15 /. 



Samples 1 and 3 (yellow snow !), common ; isolated in sample 10. 



This species differs from all hitherto described species of Cfiodatella in having very 

 short spines, which cover the surface uniformly. A full consideration will be found 

 on pp. 111-112. 



