4^ 



THK GENUS CnLORGCHYTRlOt. 



21 



C. Arclierianum^ Hieron, in Jaliresb. Scliles. Gesellscb. VaterL Cultur, 

 1887, p. 290 ; Bot, Centrallilatt. 1888, p- 822 ; cfr. Archer in Quart, Journ. 



Micr. Sci. vol. xv. p, 120, pL 7, £. 1. 



Colls globose, elliptical or irregular, up to 100 /i in diameter ; wall 

 unitbrmlj thick, usually with tubular projectton extending to epidermis of 

 host, where it is often terminated by a more or less strongly-developed 

 stopper of cellidose ; chloroplast single, consisting of a central axis with 



parietal plates often fused 



radiating branches terminated by flattened 

 together, and containing a variable number of pyrenoids. Propagation by 

 successive bipartition of contents into sexual or asexual^ biciliate zoogonidia 

 extruded in a mass of niucila^^e either through the neck or throuHi a hole in 

 the cell-w^all. Invasion of host by a germination-tube from zygote or 

 zoogonidium penetrating between epidermal cells and conveying contents of 

 zygote into sub-epidermal tissues. 



Ilah. In Lemna trisulcaj miyiovy and rjibba^ Ceratophjllum demersum^ Elodea 

 canadensis^ and Spliagmim. 



II. 0. BIENNE (Klebs), G, S, West in 'Alga?,' Camb. Bot, Handbooks, 

 vol. i. p. 212, 11)16. 



EndospJitera hiennis^ Klebs in Bot. Zeit. 39 Jahrg. no. 17, col. 265, t* 3. 



f. 17-28,1881 ; Hedwigia, 1882, p. 4; Hansgirg, Prodr, p. 12b, L 73, 1888; 

 Frank in Leunis, Syn. Pflanzenk. iii. p. 184; Wille, Die Natiirliclien 

 Pflanzenfamilien, i. Abt. 2^ p* ij&^ 1897. 



Very similar to^C. Lemiice, but tubular projection is absent, cells 60-100 /^ 

 in diameter. By successive bipartition the cell divides into a number of 

 danghter-cells each with a cell-wall, and w^ithin each of these, by a further 

 bipartition, 8-16 biciliate, sexual zoogonidia are formed ; they are extruded 

 without a mucilaginous vesicle and fuse near the opening in the mother-cell 

 walh Germination as in C, Lemna^, 



Hah, In the leaves of aquatic plants — c, g.; Potamogeton lucens and 

 Graminacetc. 



III. C. PABADOXUM (Klebs), G. S. West in ' Algfc,' Camb. Bot. Handbooks, 

 vol. i. p. 212, 1916^ 



Scoti no splicer a paradowa^ Klebs in Bot. Zeit. 39 Jahrg. no. 19, col. 300, 

 tab. 4 : Hedwigia, 1882, p. 5 ; Frank in Leunis, Syn. Pflanzenk. iii. p. 184; 

 "Wille, Die Naturlichen PHanzenfamilien, i. Abt. 2, p. ^^^ 1897. 



Cells very variable in shape and size^ 35-65 /x broad und 50-165 u. long, 

 sometimes larger; cell-w^all 2-3'5/x thick, with usually one or more striated 

 external projections and occasionally one or more small conical internal 

 projections ; chloroplast single, often massive, consisting of a central axis 

 containing a very large pyrenoid, and branched radiating ;irms which do not 



few small pyrenoids also occur. Propagation by 



fuse at the surft 



ice : a 



I ^ 



