96 Bulletin 313 



large cilium arising laterally near each end, 14-22 x 2-3.5 /x; cilia 

 10-15 /x long. Also occur on other hosts. 



572. Pycnidium from rose leaf, 2/3. 573. Spores from same, 1/12. 574. 

 Spores from raspberry, 1/12. 575. Spores from Cercis candensis, 1/12. 



DiscosiA MACULicoLA Gerard. — On the leaves of Gaultheria pro- 

 cumbens. Causes dry and whitish spots with narrow, dark borders 

 on both surfaces of the leaf. Pycnidia densely grouped, at first cov- 

 ered but becoming erumpent, 150-170 /u,; spores fusiform, slightly 

 curved, obtuse ends, greenish hyaline to smokj^-colored, 3-septate, 2 

 lateral cilia near the ends, 14-15 x 3-3.5 /x; cilia 6-7 /x long. 



576. Infected leaf of Gaultheria procumhens, 1/12. 577. Spores, 1/12. 



Sporonema oxycocci Shear. — On the leaves and rarely on the 

 fruit of the cranberry. Pycnidia scattered or grouped, dark brown, 

 under the epidermis which ruptures by an irregular or triangualr 

 slit, the upper portion thin and disappearing early, 50-100 ^l in diam- 

 eter; spores on short ovoid sporophores, h)^aline, cylindrical and 

 obtuse, 17-19 x 3-4 ti. 



578. Pycnidia, 2/3. 579. Spores, 1/12. 



Sporonema pulvinatum Shear. — On the leaves of the cranberry. 

 Pycnidia simple, dark brown, pvilvinate, under the epidermis, 

 300-420 fj. in diameter by 100-150 ix thick, sometimes collapsing, 

 spores, pale greenish, yellow in masses, subelliptical, slightly curved, 

 6-8 X 2-2.5 IX. 



580. Spores, 1/12. 



DoTHiCHiZA POPULEA Sacc. & Br. — On the twigs of the Carolina 

 and Lombardy poplar. Causes cankers and a dying of the diseased 

 parts. Pycnidia numerous, loosely grouped and covered by the epi- 

 dermis, but becoming erumpent dark, globose, depressed, becoming 

 irregular, 0.75-1 mm. in diameter ; spore in tendrils with a faint yel- 

 lov/ish-brown tinge ; spores globose-ellipsoid, in many cases with one 

 end pointed, hyaline, 10-12 x 8-10 fx. 



581. Cross-section of pycnidia, 2/3. 582. Spores, 1/12. 



Rhabdospora rubi. Ellis. — On the stems of the blackberry and 

 raspberry. Pycnidia scattered, embedded in the tissues, subglobose, 

 black, 100-195 jx; conidia linear, irregularly curved, 5-septate, 40-45 

 X 3 fx. 



583. Pjxnidia in tissue of plant, 2/3- 584. Spores, 1/12. 



Glceosporium ampelopptagum (Pass) Sacc. — On the fruit, leaf 

 and cane of the grape. Causes the "bird's eye" rot of the fruit, more 



