420 UREDINEAE. 



Uredo-Forms of uncertain relationship. 



Uredo agrimoniae (D. C). On species of Agrimonia (Britain and U.S. 

 America). Dietel regards it as related to Melampsm-a (Thecospora) agri- 

 moniae. 



U. Muelleri Schroet. On Ruhiis fmticosxis (Britain). 



U. symphyti D. C. Ou Symphytum officinale (Britain). 



U. phillyreae Cooke. On Phillyrea media (Britain). 



U. macrosora De Toni. On Epilohium tetragonum (U.S. America). 



U. vitis Thiim. This species first attracted notice as a disease- 

 producing fungus in Jamaica in 1879, but it had been found previously 

 in the United States. It causes spots on the upper surface of leaves.' 



U. fici Cact. On Ficus Carica in Italy and U.S. America. 



U. quercus (Brond.). On species of Quercus (Britain and U.S. America). 



U. iridis. On many species of /?-is (Britain). 



U. glumarum Rob. On Zea Mais in Belgium and England. 



U. sorghi Fuck. On Swghum halepense in Greece ; (compare with 

 Uromyces and Puccinia on the same host.) 



U. gossypii Lager.^ This has been observed in South America causing 

 a rust on cotton-plants and injuring the yield of cotton. It appears as 

 small purple-brown spots ; the spores are oval and yellow. 



Uredinopsis.^ 



[This is a new genus found by Magnus to contain several 

 Uredineae parasitic on Ferns.* The aecidial stage is unknown. 

 The uredospores are abjointed singly from the ends of sporo- 

 genous hyphae ; they are unicellular and without germ-pores. 

 The uredospore-sori are enclosed in a pseudoperidium of elon- 

 gated tubular cells. Unicellular teleutospores (?) are given 

 off from sori similarly to the uredospores. Pluricellular teleuto- 

 spores are developed from the mycelium in the intercellular spaces 

 of the host-plant, never from crust-like sori. On germination 

 four-celled promycelia with spherical sporidia are produced. 



Uredinopsis filicina (Niessl.) Magn. On lower surface of fronds of 

 Phegopteris {Polypodiwm) milgaris, causing death. 



Ur. struthiopteridis Stoermer. On sterile fronds of Struthiopteris 

 germanica. 



Ur. pteridis Diet, et Holw. On Pteris aquilina.] (Edit.) 



' Masses (Orevillea xxi., p. 119) states this species to be identical with U. 

 Viaiae of Lagerheim (Eevv£ gen. de Botanique, 1890). 



^ Lagerheim, Journal of Mycology, vii. p. 48. 



^Dietel, " Oredo polypodii (Pers. )" Oesterreich. hotan. Zeitschrift, 1894; also 

 " Der Gattung Uredinopsis," Ber. d. deutsch. botan. Oes., 1S95, p. 326. 



* These host-plants do not come strictly within the scope of this work, but 

 a short note on the genus is necessary. (Edit.) 



