^ k 



THE GENUS CHLOROCHYTmUM. 



23 



ver 



granulfes, and oil globules are present. Propagation bv simulfaneous division 

 into aplanospores or, more rarelj, hy successive bipartition into zoogonidia. 

 Zoogonidangia very variable in size and form, averaging 130 /x in diameter ; 

 wall striated, 6-15/^ thick, with one or two external pectic projections of 

 y variable shape and size and from one to many internal cellulose pro- 

 jections, which are often \ery large and may branch within the cytojdasm. 

 Zoogonidia asexual, biciliate, oval, or ])ear-shaj)ed, 3'5-5./i long, 2 /i broad, 

 extruded separately through a large vesicle in ihe cell-wall formed by the 

 gelatinization of its inner layers. 



Bab. Free-living in a dyke in West Yorkshire. 



VI. 0. Lbinanthemum {D. D. Cunningh.), G. S. AV'est in 'Brit. Freshw. 

 Alga3,' Camb. Biol. Series, 11)01, p. 19^. 



StomatocJiijtriuin Limnantkeinuni, D. D. Cunningham, "On an endophytic 

 Alga occurring in the leaves of Lit una id he mum huUcum," Sci. Mem. Med. 

 Officers of Army in India, ed. Sir Benj. Simpson, Part iii. 1887, pp. 33-10 ; 

 cj)\ Bot. Centralblatt. xxxvii. (1889) p. IG ;• "Wille, Natiirlichen Pflanzen- 

 familien, i. Abt. 2, p. 66, 1807. 



Young cells thin-walled, with parietal chloroplast, numerous starch 

 granules, and single nucleus. Propagation by free cell-division into zoogo- 

 nidia, which may or may not fuse and are set free separately by a splitting 

 of the zoogoni<langium-wall. Entry of host probably through stomal a in 

 motile stage, no germination-tube produced. Resting-cells formed con- 

 taining yellow-green or orange-red pigment ; walls thick, warty and brownish 

 on the outside. 



Hab. Produces yellowish raised spots on leaves of Liuuianthemum indicum, 

 India. 



c 



17, 



1883 ; Harlot, Algues recuilles par la Mission Scientifique du Cap Horn 

 (Paris, 1882-83) ; Freeman, " Observations on Chlorocht/tnum," Minnesota 

 But. Studies, vol. ii. Part III. 1898 (?). 



C. Schmitzii, Rosenvinge, " Les Algues marines du Greenland,'-' Ann. Sci. 

 Nat., Bot. 7^-^ Ser. xix. (1891) p. 109, f. 56. 



Vegetative cells spherical, elongated, or club-shaped, often irregular afc 

 lower end ; cither completely embedded in host with uniformly thick wall 

 or slightly projecting with wall thickened at outer surface ; length 80-200 /i, 

 breadth 40-100 u.. Cells enclosed in centre of frond much laroer, with 

 uniformly much thickened striuted walls. Chloroplast single, o£ variable 

 extent, parietal plate containing a variable number of pj'renoids. Propaga- 

 tion by zoogonidia ; outer end of cell elongates, penetrates to epidermis of 

 host and emits zoogonidia tlirough an ostiole at the pointed end of the tube. 



Ilafj. In SanopJti/llis arcticu and ediilis^ Giyartuia Cojistanllnea^aud Craoria 

 arctica. 



