112 



PHYCOMYCEll.s. 



on .steins, flower-stalks, radical and cauline leaves, and floral 

 envelopes. 



Leucochytrium. 



(1) Forming simple vesicles: 



S. punctatum, Schroet. On ^V >//''" pratensis. 



S. rubrocinctum, Magnus, forms little red eruptions on Sa.<-i- 

 fraga </r/tni'/"f((, the cell-sap of the host-plant becoming red. 



S. alpinum, Thomas. On V'wlu Inflow i. 



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

 /'///'//", less common on J!<tni/mulus Ficaria, Isopyrum thalictroides 

 and Jlniin-.i' Ai'cfdxn. 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. m it/i/im/n iilf* and 



FIG. 27. Sijiicliyti-iv.nl anemones. The sporocarps form Ijlack jiuiiits 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. 



