THE FUNGI WHICH CAUSE PLANT DISEASE 339 



spores with wall swelling 15-25 ix thick above; contents orange- 

 yellow fading to pale-yellow, clavate or clavate-oblong, 16-20 by 

 60-83 n, rounded at both ends or narrowed below. 



I. iEcia on Pinus sylvestris. 



II and III. Uredinia and telia on Senecio. What may be this 

 same fmigus is reported also on cultivated Cineraria."* The 

 teliospores hibernate in their dark-red sori producing promycelia 

 in the spring. The sporidia bring about spring infection of the 

 pine leaves and young twigs, later resulting in pycnia and secia. 

 The connection of the forms was established by Wolff in 1872. 



C. pini Gall."' "' 



0. Pycnia unknown, probably wanting. 



III. Telia amphigenous, on yellow spots, usually near the tips 

 of the leaves, long covered by the epidermis, 1-5 mm. long, or 

 when confluent up to 10 mm. or more, reddish-orange fading to 

 pale-yellow or dirty-white, ruptured epidermis inconspicuous; 

 teliospores with walls swelling 30-50 ix above, and soon dis- 

 appearing upon exposure; contents orange-yellow fading to nearly 

 colorless, clavate, slender, 13-20 by 60-100 ii, acute or rounded 

 above, much narrowed below, sides wavy or irregular. 



This is set apart by Arthur *' as the type of a distinct genus, 

 Gallowaya, based on the absence of spore forms other than the 

 teliospores. 



It causes serious leaf loss on Pinus virginiana. 



C. campanulse (Pers.) L6v.^ 



0. Pycnia amphigenous, scattered, numerous, originating be- 

 tween mesophyll and cortical layer, noticeable, large, 0.2-0.4 mm. 

 wide, 1-2 nam. long, dehiscent by a longitudinal slit, 90-110 ju 

 high. 



I (=Peridennium rostrupi). .^cia from a limited mycelium, 

 amphigenous, scattered, 1-3 on discolored spots, bullate, tongue- 

 shaped, large, 1-3 mm. long, 0.7-1.5 mm. high, yellow, fading to 

 white; peridium rupturing irregularly, fragile, white, cells overlap- 

 ping, outer and irmer walls same thickness, about 4-6 n, outer 

 smooth, inner moderately verrucose; spores broadly ellipsoid or 

 globoid, 17-22 by 22-31 ix; wall colorless, thin, 2-3.5 ii, densely 

 verrucose, with prominent, elongate papillae. 



II. Uredinia hypophyllous, scattered, often confluent, 0.5-1 mm. 



