200 CHYTRIDIE^. 



GENUS 78. OLFIDXUM. Braun. (1856.) 



Cells globose or subglobose, parasitic, epiphytal, or endo- 

 phytal, not operculate, nor rooting ; mouth vertical, elongated 

 into a cylindrical tube. 



Olpidium endogenum. Braun CJiytrid. Fo. 20, t. v., f. 21. 



Parasitic in the interior of plants, usually gregarious, de- 

 pressedly globose, extended at the apex into a tubular neck, 

 which is globosely dilated in the middle ; perforating the mem- 

 brane of its host, is extended beyond with a funnel-shaped 

 mouth. 



SIZE. Cells about '024 mm. diam. 



Olpidium intestinum (Braun), Eabli. Alg. Eur. iii., 283. 



Parasitic in Closteriwn, Vaucheria, &c. 



This appears to be the species figured by Henfrey as occurring within 

 the cells of Eremosphcera vindis in '' Quart. Journ. Micr. Sci." vii. (1859), 

 t. 3, figs. 11, 12. Also by Carter in Spiroqyra, in " Annals of Natural 

 History," 2nd Series, Vol. xvii. (1856), t. 9, 'figs. 9 and 10. 



Plate LXKX1. ficj. 2. Olpidium endogenum parasitic in Closterium 

 lunula X 400. 



Olpidium ampullae eum. (Braun.} Rabh. Alg. Eur. ill., 282. 



Epiphytal, gregarious, globose, small, sessile, rarely pedicel- 

 late, tubular, mouth erect, cylindrical, about as long as the cell, 

 terminating in a conical apiculus. 



SIZE. Cells "0065 mm. diam. 



Chytridium ampullaceum, Braun Chytrid., p. 66, t. 5, f. 24-27. 



Parasitic on various alga3. 



It was probably this, or a closely-allied species, which was figured by 

 Henfrey as parasitic on Eremosphcera viridis in " Quart. Journ. Micr. 

 Sci." vii. (1859), t. 3, f. 13, 14. 



Plate LXXXL fig. 3. Olpidium ampullaceum parasitic on Mougeotia 

 X 400 ; 3a, individual further magnified. Fig. 4, allied species x 400. 



GENUS 79. SYNCHITRIU1VI. D.By. % Wor. (1863.) 



Thallus multiform. Cells (sporangia of some authors) often 

 numerous and aggregated, closely involved in a common mem- 

 brane, forming sori, filled with delicately granular orange con- 

 tents. Zoogonidia globose, rarely oval or oblong, with a lateral 

 orange-red nucleus, bearing a single (rarely 2) very long cilium. 



Inhabiting the substance of plants, with the habit of Ure- 

 dines, but without mycelium. 



