508 Kern: Studies in the genus Gymnosporangium 



associated with an aecial form on Aroma. This Roestelia on 

 Aroma resembles in general appearance the Roestelia cornuta 

 (Pers ) Fries on Sorbus, but a microscopical examination shows 

 that it is morphologically distinct. This fact has assisted in 

 arriving at the conclusion that the telial form under discussion is 

 not identical with the one connected to Roestelia cornuta on Sorbus 

 in Europe, and it is therefore characterized as a new s P ecies - 

 is hoped that cultures may soon be made which will give addi- 

 tional information. In the selection of a name the author has 

 taken the opportunity to show his regard for the valuable service 

 rendered to mycology by Dr. Davis and especially a PP recia J ed 

 of his assistance in the study of this species. It may be a 

 here that Roestelia cornuta on Sorbus occurs in this country 

 no telial form has ever been found associated with it. 



Gymnosporangium exiguum sp. no v.* 



Telia foliicolous, scattered irregularly, tongue-shaped ^con^l 

 small, 0.5-1 mm. thick, 1-1.5 ^m. high, chestnut-brown 



spores 2-celled, ellipsoid, 18-23 fi X 45"55 P> ™ U ™ tr : cted at the 

 narrowed both above and below, slightly or no - con ^ icel hya i in e, 

 septum; wall cinnamon-brown, about 1 . 5 f* thick » P ne ar the 

 5-6 n in diameter, long; germ pores 2 in eacn 



septum. 



[Juniper us 



virgin 



895, F. Grasso. . 

 - - { Junipemsf 



Long. 



*) 



March and April, 19 



It some 



This is a very delicate and inconspicuous specie • hoSt 



J ... i:„^;Knhnn on ^ 



Nelsoni 



and in the shape of the sori. It differs from tr. iw 

 having slender terete pedicels instead of inflatedones. 



; picHii»i by 



There is at 



el -**?£» 



ulifonnibus vel con..- ; 



* Teliis foliicolis, irregulanter disposes, upu«w«~- e llip s0,ac j 



mm. crassis, l-l. 5 mm. altis, castaneo-brunneis ; teliospons unisep , . ^ non , 



23 * X 45-55 * apice et basi rotundatis vel interdum ««^ ; pedice Uo by^ ' > 

 vix constrictis ; episporio cinnamomeo-brunneo, ca. i-bf 1 'j s ^ 



6 * diam., longo ; poris germinationis binis juxta septum ins " ^.^ ,Te**V 

 In foliis Sabinae virginianae (Juniperi virgimatiae) re 



1895, F. Grasso. 



