79 



(f ) Rust of Spruce and Labrador Tea (Melampsora abi- 

 etina. ) This fungus much resembles the last in habit and life history. 

 The teleutospores, however, are developed on the under side of the leaves. 

 This fungns is also comm.on in eastenji Canada. 



(g) Rust of Spruce and Leather Leaf (Melampsor- 

 opsis Cassandrae ) . This species resembles the last two in habit, the 

 spring spores being produced on the various species of spruce, but the 

 summer and winter spores are found on the leather leaf ( Chamae daphne 

 calyculata ) . 



( h ) Rust of Larch and Birch ( Melampsoridium betulinum ) . 

 The summer spore stage attacks the leaves of the birches and causes 

 them to turn yellow. The aecidial stage on the larch has not yet been 

 collected in North America. 



( i ) Rust of Fir and Chickweed ( Melampsorella elatina ) . 



The aecidial stage of this species causes conspicuous witches' brooms on 

 the balsam fir. These are quite common in Eastern Canada. The uredo- 

 spore and teleutospore stages are found oni the Chick"weed. They are in- 

 conspicuous and rarely collected. 



(ji) Rust of Spruce Cones and Pyrola ( Melampsoropsis 



pyrolae ) . This rust is rather common locally on the cones of the spruces 

 in some regions of the Maritime provinces. It is also probably common 

 in the coniferous regions of Quebec. The spores are produced in great 

 abundance on the scales of the cones. The uredospores appear on the leaves 

 of Pyrola plants in early spring. They are soon foUow^ed or accom- 

 panied by the teleutospores, which germinate about the 24th of May 

 on the host plant. The sporidia are carried by the wind to the cones of 

 the neighbouring spruces, and by the first of July the stage on the cones 

 is mature. 



(k) Rust ( of Balsam Fir and S^ f Willow: Herb ' Puccinias- 



trum pustulatum ) . The aecidial stage of this species occurs on the leaves 

 of the balsam fir during June. Later in the season the uredospores and 

 teleutospores develop on the leaves of the willow^ herbs ( Epilobium ) . 



( 1 ) Rust of ?f5 Hemlock and Blueberry ( Pucciniastrum 



myrtilli ) . This rust is very common on the leaves of hemlock m many 

 regions in eastern Canada. The uredospiores and teleutospores are pro- 

 dAiced on the blueberry. They are also found on the huckleberry. The 

 spring spore stage of the hemlock is usually passed as Peridermium 

 Peckii. 



(m) Rust of Hemlock and ^Rhodora (Pucciniastrum 

 minimum ) . This species cloisely resembles the last one described, but the 

 ure.] )Spores and teleutospores are developed on the Rhodora ( Rhodora 

 earadense) . 



