114 PHYCOMYCETES. 



"but send a hyphal process inside, which hranches into a tuft 

 of rhizoids. Resting-spores may be found, several in each cell. 



Cladochytrium (Urophlyctis) pulposum, (Wallr.), causes on 

 leaves, stems, and tiowers of Ghenopodium and Atriplex glassy 

 swellings, in the undermost cells of which are situated the 

 ^oosporangia. The resting-spores have brown shining walls and 

 lie inside the cells. The zoospores are uniciliate. 



01. (Ur.) butomi, Biisgen. On leaves of Butomiis umbellatios. 

 Black spores are produced containing resting-spores. The col- 

 lecting cells have tufts of hair. 



Physoderma. 



Zoosporangia are absent. Resting-spores formed, several in 

 €ach host-cell. 



Cladochytrium (Ehy.) menyanthis, De Bary (U. S. America). 

 On leaves and petioles of Menyanthes trifoliata this forms 

 vesicles containing resting-spores. The collecting cells have 

 terminal hair-tufts. Diseased leaves are generally smaller than 

 healthy. 



CL (Phys.) flammulae, Biisgen, forms little swellings on 

 leaves of BanuTiculiis Flammula. 



OL (Phys.) Eriegerianum, Magnus, causes transparent swell- 

 ings on Carum Carui. 



CI. (Phys.) iridis, De Bary, on Iris pseudacorus. 



Fischer mentions other species on Scirpus, Alisma, JRanunculus, 

 Poterdilla anserina, Silaus pratensis, Sium latifolium, Phularis, 

 Glyceria, Symphytum, Mentha, Rwmex, Allium, etc. 



Prunet^ describes Cladochytrium viticolum as the cause 

 of the much-discussed Brunisure of vine ; also CL mori as a 

 new disease of the mulberry.* 



The same authority ^ designates as Pyroctonum sphaericum, a parasite on 

 wheat, which has become very abundant in Southern France. 



(2) ZYGOMYCETES. 



Unicellular fungi. Sexual reproduction does not take place by 

 the fertilization of an ovum in an oogonium by an antheridium, 



iPrunet, Gompt. rend., 1894. ^Prunet, Gonipt. rend., cxx., 1895, p. 222. 



sprunet, Oompt. rend., 1894, ii., p. 108. 



