112 



PHYCOMYCETES. 



on stems, flower-stalks, radical and cauline leaves, and floral 

 envelopes. 



Leucochytrium. 



(1) Forming simple vesicles: 



S. punctatum, Schroet. On Gagea joratensis. 



S. rubrocinctum, Magnus, forms little red eruptions on Saxi- 

 fraga gramdata, the cell-sap of the host-plant becoming red. 



S. alpinum, Thomas. On Viula lijlora. 



S. anomalum, Schroet. (U. S. America). On Adoxa Moscha- 

 tellina, less common on Ranunculus Ficaria, Isopyrum thalictroides 

 and Rumex Acetosa. The size and shape of the swellings, as well 

 as of the spores, are very variable. 



(2) Forming compound vesicles : 



S. anemones, De Bary and Wor. (U. S. America). On 

 Anemone nemorosa, A. ranunculoides and Thcdictnim purpiira- 



FlG. 27. — Synchytrium anemones. The sporocarps form black points on leaves, 

 petioles and perianth of the Anemone ; the laminae are also stunted and distorted' 

 (V. Tubeuf del.) 



scens, attacking stems, leaves, or flowers, and forming eruptions 

 whose cells contain a red sap. In very bad cases, crumpling 

 and swelling of attacked organs occur. 



