418 



UREDINEAE. 



Caeoma. 

 Caeoma abietis-pectinatae Eeess.^ The aecidiospores may 

 be found on the lower surface of young 

 needles of silver fir ; the aecidia are yellow 

 elongated cushions situated on either side 

 of the needle mid-rib, and are without 

 peridia. Pycnidia (spermogonia) are pro- 

 duced before the aecidia. The mycelium is 

 septate and intercellular with few haustoria. 

 I have found the fungus fairly abundant 

 on the Alps and in the Danube valley near 

 Passau. Teleutospores are unknown. 



Caeoma deformans (Berk, et Br.) Tubeuf 

 ( Uromyces deformans Berk, et Br.^ or Caeoma Asanuro Shirai).^ 

 This induces the formation of " witches' brooms " or of antler-like 



Fig. 253.— Caeoma abietis 

 pecti7iatae. Needle of Silver 

 Fir showing Caeoma-pa.tches 

 on the lower surface, (v. 

 Tubeuf del.) 



Fig. 254.— Caeoma dejoinnans on Thuiopsis dolabrata, (v. Tubeuf phot, from dried 

 material presented by Prof. Grasmann of Tokio.) 



1 Reess, Rostpihformen, 1869. 



^Berkeley, "The fungi collected during the expedition of H.M.S. 'Chal- 

 lenger.'" Jour, of Linnean Soc, xvi., 1876. 

 3 Shirai, Botanical Magazine, Tokio, 1889. 



