UROCYSTIS. 



317 



U. Leimbachii (Oertel.) causes globular swellings of the 

 stem-base of Adonis aestivalis at Jena (Fig. 173). Patouillard 

 regards this species as a form of U. anemones, differing somewhat 

 on account of its underground habitat. 



U. sorosporioides Korn. (Britain). On Pulsatilla alpina, Thalic- 

 trum ■minas, and T. foctidum, forming pustules and swellings. 



Fio. IIZ.—A, VrocyUu anenxoms on Hellebore. Spore-patches on stalk and 

 mid-rib. (v. Tubeuf del. ; specimen from Herr Schnabl of Munich.) 



B, Orocystis Leimbachii (U. anemonet), causing swelling at base of stem of Adonis 

 aestivalii. (v. Tubeuf del.; specimen from Prof. Stahl of Jena.) 



U. violae (Sow.). (Britain and U.S. America.) The deforma- 

 tions induced by this brand are not uncommon on Viola 

 odorata in gardens, also on V. tricolor, V. hadensis, and V. 

 hirta. Its presence is shown externally by the marked thick- 

 ening and malformation of leaf-petioles, runners, leaves, and 

 fruit-stalks (Fig. 174). The swellings extend round the whole 

 stem, and form pustular outgrowths on the leaves ; the black 

 spore-masses appear after rupture of the epidermis. The 

 flower may develop normally although other organs are diseased. 

 Ill a case from the garden of Prof. Hartig, a flower-bud 

 unfolded prematurely in the autumn, its stalk was very 

 much deformed, the flower itself was somewhat stunted, yet 



