234 BOTANICAL GAZETTE [SEPTEMBER 
Trisetum subspicatum (L.) Beauv. and T. majus (Vasey) Rydb.; the species is 
i as Puccinia monoica (Peck) Arthur. Gymnosporangium Nelsom 
Arth. (G. durum Kern) from Juniperus utahensis (Engelm.) Lemmon produced 
only pycnidia on Amelanchier vulgaris Moench. Gymnosporangium effusum 
Kern from Juniperus virginiana L. produced only pycnidia (Roestelia trans- 
formans Ellis?) on Aronia arbutifolia (L.) Ell. Gymnosporangium gracilens 
(Peck) Kern et Bethol. from Juniperus monosperma (Engelm.) Sarg. produced 
pycnidia and aecidia on Philadelphus coronarius L. In addition to these, 
cultures of 15 species are reported as confirming previous work. 
Fraser,’ who has been investigating the rusts in Canada, especially 
those inhabiting conifers, reports the following species whose relations have 
been worked out for the first time. Neciuwm Farlowii Arthur from Tsuga 
canadensis sown on the same host produced only teleutospores but no pycnidia. 
Melampsoropsis (Chrysomyxa) Pyrolae (DC.) Arth. from Pyrola americana 
Sweet and P. elliptica Nutt. produced pycnidia and aecidia (Peridermium 
conorum-Piceae [Schw.] Arth.) on cones of Picea mariana (Mill.) B.S.P. and 
P. canadensis (Mill.) B.S.P. Pucciniastrum minimum (Schw.) Arth. from 
Rhodora canadense (L.) B.S.P. produced aecidia (Peridermium Peckit Thiim.) 
on leaves and cones of Tsuga canadensis (L.) Carr. Uromyces Spartinae Farl. 
from Spartina Michauxiana Hitch. infected Arenaria lateriflora L., but failed 
to infect Spergularia canadensis (Pers.) Don, while the same rust from Spartina 
patens (Ait.) Muhl. and S. glabra var. alterniflora (Loisel) Merr. infected Sper- 
gularia canadensis, but failed to infect Arenaria lateriflora L. Melampsora 
arctica Rostr. from Salix discolor Muhl. produced pycnidia and aecidia (Caeoma 
sp.) on Abies balsamea (L.) Mill. Melampsora (Medusae Thiim?) from 
Populus grandidentata Michx. produced pycnidia and aecidia (Caeoma Abietis 
canadensis Farl.) on Tsuga canadensis (L.) Carr., and in one case pycnidia on 
Larix laricina. Cultures confirming former work are reported for 12 species. 
great interest is the discovery of the relation between certain fern rusts 
and the aecidial forms known as Peridermium balsameum Peck on Abies 
e OCK™ succeeded in establishing the relation between Peridermium 
amentosum Peck and the Cronartium on species of Castilleja. The aecidi- 
8 
Fraser, W. P., Cultures of heteroecious rusts. Mycologia 4:175-193- 1912: 
———, Note on the life histori dinopsis. 
Science N.S. 36: 59S. 1912. ories of the fern rusts of the genus Uredinop. 
Bt 
Peck, comer G. C., The Cronartium associated with Peridermium filamentosum 
- Phytopathology 2°176-177. 1912. 
