198 
APPENDIX 
TO CHLOROPHYLLOPHYCE A. 
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 Alga. The Saprolegniee are 
not included, because they are now generally acknowledged as 
Fungi. The genus Synchitrium also appears to be more nearly 
related to Protomyces, amongst Fungi, than to Algae. 
Famity. CHYTRIDIEA. 
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 mucilaginons, 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 Chytridium, whilst others have distributed them over several 
genera, as Chytridium, Philyctidium, Rhyzophidium, Olpidium, and 
Rhizidium, but apparently without good reason. 
Genus 76. CHYTRIDIUM. Brawn. (1851). 
Cells globose or somewhat pear-shaped, operculate above, the 
root-like base usually innate in various alge, penetrating the 
membrane of their cells. 
Zoogonidia very numerous, globose, with a nucleus, bearing a 
single very long cilium, escaping through the orifice of the cell 
caused by the falling away of the operculum. 
