FiQ. 240.— Cedar AppUi caused 

 Gyiiinonporai 

 Tubexif del.) 



w GymnoKporangium macrop 



~ ■ ■ del- 



(iYMNOSPORANGIUM. 403 



G. globosum Farl. Aecidia on Pyrus Mains, P. communis, 

 (.'//(/oil la cahjarls, Sorhus amcricana, and species of Crataegus. 



G. nidus -avis Thaxt. Aecidia and pycnidia on Pyrus Malus, 

 Aindanchicr canadensis, and Cydonia vulgaris. On tlie red cedar 

 it causes the " bird's nest " deformation of the branch-system. 



G. speciosum Peck. On Junijyerus 

 o<:cuh itlid IX. 



G. Cunninghamianum Barcl. On 

 L'jllircssus Innduxd in the Himalaya. 

 Aecidia on Pyrus Pashia. 



' v\Sl\ 



The following genera do not occur 

 in Europe. Coleopuccinia, RaccncHa, r/' 



Ahcolaria, Trichospora. 'j 



Ravenelia alone amongst these / 



contains parasitic species of import- 

 ance. They all occur on Leguminosae 

 and Eupliorbiaceae in the warmer parts 

 of India, Africa, and America.^ 



Ravenelia Volkensii Henn. has teleutospore-sori which appear 

 on " witches' broom " deformations of the twigs of an Acacia in 

 Usambara. 



Rav. pymaea Lager, et Diet, produces its teleutospores on 

 malformed branches of Phyllanthus in Ecuador. 



Certain forms of Aecidivm which cause deformation of species 

 of Acacia .should probably be included in this genus (see p. 410). 



Endophyllum. 



Teleutospores originate serially on cushions which are enclosed 

 in a peridium similar to aecidia ; on germination, a four-celled 

 promycelium is produced.- Leaves of Euphorbia, Sedum, or 

 Sempcrvivum inhabited by mycelium develop abnormally. 



Endophyllum euphorbiae-silvaticae (D. C.) (Britain). Accord- 

 ing to Winli'r, the ])cridia arc ri'gularly distributed over the 

 underside of the leaf of Euphorhia amygdaloides ; they have 

 white fissured margins either erect or somewhat turned back. 



' Dietel, "The Genus Ravenelia," Nedwit/ia, 1894. 



- The teleutospores of this genus might be (lescribeil as aecidiospores whicli 

 produce promycelia. 



