Fraser: Further Cultures of Heteroecious Rusts 239 
Summary of Cultures Described in this Article 
1. Life histories established for the first time. 
Urediiiopsis Striithioptcridis Stormer. Two successful sow- 
ings of teliospores from Onoclea Struthiopteris (L.) Hoffm. 
on Abies balsamea (L.) Mill. Three successful sowings of 
aeciospores from Abies balsamea on Onoclea Struthiopteris. 
Uredinopsis Osmundae Magn. Six successful sowings of telio- 
spores from Osmnnda Claytoniana L. on Abies balsamea. 
Uredinopsis Atkinsonii Magn. Aeciospores from Abies bal- 
samea infected Aspidinm Thelypteris Sw. 
Uredinopsis Phegoteridis Arthur. Teliospores from Phegop- 
teris Dryopteris (L.) Fee infected Abies balsamea. 
Uredinopsis mirabilis ]\Iagn. Teliospores from Onoclea sen- 
sibilis L. infected Abies balsamea. Three successful sowings 
of aeciospores from Abies balsamea on Onoclea sensibilis. 
2. Life histories supplementing previous work. 
Pucciniastrum Myrtilli (Schum.) Arthur. Teliospores from 
Vaccinium canadense Kalm. infected Tsuga canadense 
(L.) Carr. 
Melampsora Medusae Thiim. Teliospores from Populits gran- 
didentata Michx. infected Tsuga canadensis (L.) Carr. 
Melampsora arctica Rostr. Teliospores from Salix infected 
Abies balsamea (L.) Mill. 
Macdonald College, 
Province of Quebec, Canada. 
