BY G. I. PLAYFAIR. 137 



variation of Tr. granulata (Studien iiber Chlorophyceen, 1900, ii.) 

 leave no doubt that Trochisia, under certain circumstances, 

 develops chlorophyll, living and reproducing itself in the manner 

 of the Algge. Nevertheless, though I have noted I'r. hirta, Tr. 

 granulata and 'Tr. reticulata from a number of localities in this 

 country, the cytoplasm has been invariably hyaline, as was also 

 the case in the forms observed in these samples. Add to this 

 their development, as shown in the formce immature^ above, and 

 the fact that they are always found on decaying cells, and I can 

 only conclude that the forms of Trochisia are essentially sapro- 

 phytic in character. The genus seems to me nearest to Chytri- 

 dium of all the algal fungi. The minute immature forms of the 

 green algae may occasionally be pale blue, but never hyaline, as 

 in this plant. 



Trochisia verrucosa, n.sp. (PI. vii., f.3). 



Cellulse globosse vel ellipticae, verrucisquadratis dense obtectis. 

 Cytoplasma hyalinum. 



Long. 58, lat. 34; verrucas long. 2-3 /z. 



Lismore, on decaying Spirog. maxima (20). 

 Genus Chytridium A.Br. 

 Chytridium gregarium Nowakowski. (PI. vii., f.4). 



Cell. long. 32-48, lat. 26 /x. 



Lismore, in dead Rotifer (16). 



Cf. Nowakowski, Kentnn. d. Chytridiaceen, i., p. 77, T.iv , f,2. 

 Chytridium amphoridium, n.sp. (PI. vii., f.5). 



Cellulae lageniformes ; corpore globoso superne in collum 

 angustum protracto. Cytoplasma hyalinum. 



Long. cell. 12, corp. 7, coll. 5; lat. corp. 6, coll. 2 /x. 



Casino, on Hydrodictyon {\i). 



Genus Rhizidium A.Br. 

 Rhizidium mycophilum A.Br. (PI. vii., f.6). 



Zoosporangia immatura, suhglohosa diam. 7-10, cell, basal, 

 (dauerspora) diam. 7-10, 'pyriformia long. 13-22, lat. 9-14, cell, 

 basal, diam. 10-14. Zoosporangia matura ovata, long. 40, lat. 24, 

 cell, basal, diam. 18; zoospor. diam. 6, flagell. long. 20-25; hyphae 

 lat. 1-2 /x. 



