80 - BOTANICAL GAZETTE [JANUARY 
and may be an indication of y lationship b h heteroecious 
forms and the nena micro- and lente esta: The cultural work with 
Aecidium Euphorbiae Gerardianae further showed that there exists a certain 
degree of specialization among the forms of Uromyces caryophyllinus, for of 
several members of the pink family Saponaria was the only one that could be 
infected by aecidiospores from Euphorbia Gerardiana. 
mosporangium tremelloides had therefore been experimentally con- 
nected only with the aecidium on Sorbus Aria, although Aecidium penicillatum 
Miiller occurs on a large number of pomaceous plants. The present work adds 
to Sorbus Aria three new aecidial hosts, two of which are probably hybrids, with 
S. Aria as one parent. Ochrospora Sorbi, which occurs on various species of 
Sorbus, has been connected with Aecidium leucospermum by TRANZSCHEL, but 
the form on Aruncus (Spiraea) sylvester had not previously been connected with 
that aecidium. 
In the second paper’ the author’s studies on the biology of the forms of 
Gymnosporangium are continued. He finds that the Roestelia cornuta on 
Sorbus torminalis (L.) Crantz and S. latifolia (Lam.) Pers. has its teleutospores 
on Juniperus communis L. The small cushion-like sori occur on the leaves and 
resemble those of Gymnosporangium juniperinum L. The new form is distinct 
from both G. juniperinum and G. Amelanchieris, however, as neither of these 
produce aecidia on Sorbus torminalis and S. latifolia. The author proposes the 
name G. tormanili-juniperinum for it. 
Cultures with Gymnosporangium juniperinum extend the list of aecidial 
hosts of this species to include Sorbus americana DC. and S. hybrida Koch, 
in addition to S. aucuparia L., which was previously known. On account of 
the successful infection of Sorins americana, the author suggests that this 
form is identical with the form occuring on Juniperus Sibirica Burgsd. (J. 
nana Willd.) in America, as the American form was shown by ARTHUR to have 
aecidia of the cornuta-type on Sorbus americana. The American form is 
called by ARTHUR S. cornutum (Pers.) Arthur. 
Further cultures with teleutospores of Gymnosporangium Amelanchieris 
show that this form does not infect Aronia nigra Kochne, and is therefore not 
identical with G. Davisii Kern, which has aecidia of the cornuta-type on Aronia 
nigra. In it - ses ini sled out = fact that often hybrids of 
an immune a Spee ible. This condition, however, 
is not none 
TRANZSCHEL® en the following results of cultures made in the years 
1906 and 1907. Puccinia Porri (Sw.) Winter, sown on its host Allium 
Schoenoprasum L., produced uredinia and telia directly, without first forming 
spermagonia or aecidia. This rust, therefore, is a true hemi-Puccinia, and the 
7 FIscHER, Ep., Studien zur Biologie von Gymnosporangium juniperinum. Zeit- 
schr. Bot. 2:753-764. 1910 
8 TRANZSCHEL, W., Beitrige zur Biologie der Uredineen. III. Travaux Musée 
Bot. Acad. Imp. Sci. St. Pétersbour 721-19. 1010 
