198 



APPENDIX 



TO CHLOROPHYLLOPHYCEJB, 



In the form of an Appendix, we shall here enumerate a few 

 species, of doubtful position, which are not known with sufficient 

 exactitude to be recorded in systematic order, although their 

 affinities appear to be with the Algas. The Saprolegniece are 

 not included, because they are now generally acknowledged as 

 Fungi. The genus Syncliitrinm also appears to be more nearly 

 related to Protomyces, amongst Fungi, than to Algfe. 



FAMILY. CHYTKTDIE^E. 



Plants for the most part aquatic, parasitic, epiphytal or endo- 

 phytal, occasionally epizoic, very rarely terrestrial, one or two- 

 celled. Cells vesiculose, single or gregarious, either innate in 

 the fostering plant, or penetrating its membrane ; furnished 

 with radicles at the base, or destitute of them ; now and then 

 numerous and densely aggregated, involved in a common mem- 

 brane, nestling in the parenchyma of terrestrial plants, and form- 

 ing pustules. Protoplasm mucilaginous, usually colourless, 

 sometimes coloured. Antheridia not yet observed. Propaga- 

 tion by oospores or zoogonidia. 



Some authors have united the majority of the species under the one 

 genus Chi/tridium, whilst others have distributed them over several 

 genera, as Chytridium, Phlyctidium, Rhyzophidiitm. Ofyidiicm, and 

 Rhizidlum, but apparently without good reason. 



GENUS 76. CHYTRIDIUM. Srann. (1851). 



Cells globose or somewhat pear-shaped, operculate above, the 

 root-like base usually innate in various algas, penetrating the 

 membrane of their cells. 



Zoogonidia very numerous, globose, with a nucleus, bearing a 

 single very long ciliuni, escaping through the orifice of the cell 

 caused by the falling away of the operculum. 



