336 UREDINEAE. 



As a preventive measure, it would be advisable to keep 

 down spurge-plants near fields or gardens where peas are likely 

 to be attacked. 



XJ. striatus Schroet. (U. S. America). Uredo- and teleutospores 

 on species of Lohis, Medicago, Trifolium, and sometimes Vicia. 

 Pycnidia and aecidia are produced on Euphorbia Gyparissias ; 

 the mycelium induces changes in the tissues similar to the 

 preceding species, but the Euphorbia remains stunted instead 

 of elongating as in attacks of (7. pisi. 



U. dactylidis Otth. Uredo- and teleutospores on species of 

 Poa, Dactylis, Avena, and Brachypodium. Aecidia on several 

 species of Ranunculus (not on R. Ficaria). (Britain and U.S. 

 America.) 



U. poae Eabh. Uredo- and teleutospores on Poa ; Aecidia 

 on Ranunculus Ficaria, R. bulbos^is, and R. repens. (Britain). 



U. lineolatus Desm. (IT. maritimiis Plowr.).^ Uredo- and 

 teleutospores on Scirpiis maritimus. Aecidial {orms = Aeddium 

 sii latifolii on Siuni and Aec. hippuridis on Hippuris, also a 

 form on Glaux maritima in Britain. 



U. junci Desm. Uredo- and teleutospores on species of Juncus. 

 Aecidia on Pulicaria. (Britain and U.S. America.) 



(3) Only uredospores und teleutospores knoum ; they frequent 

 the same host. 



Uromyces caryophyllinus (Schrank.)^ Carnation East. [This 

 attacks carnations at all stages of growth. The mycelium extends 

 inside the plant and forms spore patches which rupture the 

 epidermis. Uredospores are produced first, then the teleuto- 

 spores ; the former germinate at once, the latter only after a 

 resting-period. The use of sprays of potassium sulphide or 

 copper sulphate, and the cultivation of hardy varieties have been 

 recommended.] (Edit.) 



Uromyces scutellatus (Schrank.). On species of Euphorbia. 

 The mycelium is perennial in the root-stock and permeates the 

 whole plant. Teleutospores developed in dark-brown spots on 

 the under surface of leaves. Diseased stems are generally un- 

 branched, and carry only small leaves and no flowers. 



^ Plowright, Gardener's Chronicle, 1890. 



^Halsted, N. Jersei/ Agric. Coll. Exper. Station Report, 1891. Atkinson, 

 "Carnation Diseases," American Carnation Sac; with Illustrations, y. I'ork 

 Agric. Exper. Station Bvlletin, 1896. 



