﻿Vol. 42 



BULLETIN 



TORREY BOTANICAL CLUB 



FEBRUARY, 191 5 

 A new North American Endophyllum* 



J. C. Arthur and F. D. Fromme 



The genus Endophyllum, of which E. Sempervivi is the type and 

 the best known example, is distinctive in that its spores, to all 

 outward appearances aeciospores, being accompanied by inter- 

 calary cells and a peridium and borne in an Aecidium-like fructi- 

 fication, are in reality true teliospores that give rise to promycelia 

 and basidiospores on germination, as Hoffmanf and others have 

 conclusively demonstrated. Gymnoconia, thought to be an aecial 

 form until the recent notable work of Kunkel| on G. inter stitialis, 

 is to be considered an allied genus, in which the teliospores have 

 intercalary cells but are not enclosed in a peridium. In both 

 cases the vegetative mycelium is perennial in the tissues of the 

 hosts and the life histories are completed with the production of 

 a single spore form, the teliospore, in addition to the basidiospores 

 and pycniospores. 



During the past summer we have succeeded in demonstrating 

 the Endophyllum character of Aecidium tuberculatum Ellis & 

 Kellerm., a rust of the western prairies and uplands on malvaceous 

 plants, especially Callirhoe involucrata. 



The Callirhoe rust has been an object of investigation by the 



* Read before the Botanical Society of America at the Philadelphia meeting, 

 December 29, 1914. 



t Hoffman, A. W. H. Centralbl. f. Bakt. 2 Abt. 32: 137-158- 1912. 



t Kunkel, L. O. Bull. Torrey Club 40: 351-366. pl. 3- I9i3- Am. Jour. Bot. 



