1 1 4 PHYCOMYCETES. 



but send a hyphal process inside, which branches into a tuft 

 of rhizuids. Uesting-spores may be found, several in each cell. 



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

 leaves, stems, and flowers of Chenopodium and Atriplex glassy 

 swellings, in the undermost cells of which are situated the 

 zoosporangia. The resting-spores have brown shining walls and 

 lie inside the cells. The zoospores are uniciliate. 



Cl. (Ur.) butomi, Biisgen. On leaves of Butomus wnibdlatus. 

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

 lecting cells have tufts of hair. 



Physoderma. 



Zoosporangia are absent, liesting-spores formed, several in 

 each host-cell. 



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

 ( )n leaves and petioles of Menyantlies 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 Ranunculus Flammula. 



Cl. (Phys.) Kriegerianum, Magnus, causes transparent swell- 

 ings on Carton Garni. 



Cl. (Phys.) iridis, De Bary, on Iris pseudacoru*. 



Fischer mentions other species on Scirpus, Alisma, Ranunculus, 

 Potentilla anserina, Silaus pratensis, Slum latifoliiim, Phalaris, 

 Gflyceria, Symphytum, Mentlia, Rumex, Allium, etc. 



Prunet l describes Cladochytrium viticolum as the cause 

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

 new disease of the mulberry. 2 



The same authority 3 designates as Pyroctonum sphaericum, a pavusitr <>n 

 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, 



1 Prunet, Compt. rend., 1894. a Prunet, Compt. rend., cxx., 1895, p. 222. 

 3 Prunet, Compt. rend., 1894, n., p. 108. 



