Part 1, 1922} PHYLLOSTICTACEAE 17 
28. Phyllosticta Humuli Sacc. & Speg.; Sacc. Michelia 1: 144. 1878. 
Phyllosticta Humuli major Ellis & Ev. Jour. Myc. 5: 145, 1889. 
Spots circular or subcircular, yellowish or whitish, surrounded by a very narrow, slightly 
elevated rim, reaching a diameter of 2-3 mm., about equally visible on either side of the 
leaf; pycnidia scattered over the infected spot, yellowish, reaching a diameter of 80-90 y; 
spores rather large, subcylindric, variable in size and form but usually about 3-5 X 12-16 nu. 
On CaNNABINACEAE: 
Humulus Lupulus L., Iowa. 
TYPE LocaLity: Italy, on Humulus Lupulus. 
DISTRIBUTION: Iowa; also in Europe. 
29. Phyllosticta tuberosa Ellis & Martin; Martin, Jour. Myc. 
2: 26. 1886. 
Spots subcircular in form, pale-yellow or whitish in the center, surrounded by a slightly 
elevated circumscribing line or occasionally with several concentric lines, reaching a diameter 
of 2-3 mm., about equally visible on either side of the leaf; pycnidia sparingly scattered over 
the infected spot, mainly on the upper side, reaching a diameter of 180; spores ellipsoid or 
fusoid, 4-6 X 12-18 w, often containing several oil-drops. 
On ASCLEPIADACEAE: 
Asclepias tuberosa I,., New Jersey. 
Asclepias incarnate L,., Delaware. 
?Asclepias variegaia I,., New Jersey. 
TYPE LOCALITY: New Jersey, on Asclepias tuberosa. 
DISTRIBUTION: New Jersey and Delaware. 
Exsiccatt: Ellis, N. Am. Fungi 1161. 
30. Phyllosticta phomiformis Sacc. Michelia 2: 573. 1882. 
? Phyllosticta Quercus-rubrae W. Gerard, Bull. Torrey Club 6:78 1876, (Host erroneously determin- 
ed as Quercus rubra.) 
Spots circular or subcircular in form, or slightly irregular, pale-yellowish in the center, 
with a dark reddish-brown area around the outside, reaching a diameter of 3-4 mm., visible 
on both sides of the leaf but uniformly pale-yellow on the under side; pycnidia rather thickly 
scattered over the lighter portion of the spot, reaching a diameter of 150 »; spores large, ellip- 
soid or subfusoid, straight or slightly curved, reaching a length of 18-22 » and a diameter 
of 6-8 pu. 
ON Facacesez: . ae . 
Quercus alba I,., Massachusetts, New Jersey, Pennsylvania, Wisconsin; Ontario. 
Quercus macrocarpa Michx., Connecticut. 
Quercus Prinus L., Kansas. f . 7 
Quercus stellata Wang. (Quercus obtusiloba Michx.), Florida, Missouri, New Jersey. 
Quercus sp., Massachusetts, New York, Pennsylvania. 
TYPE LOCALITY: Pennsylvania, on Quercus alba. . 
DISTRIBUTION: Massachusetts to Wisconsin, Kansas, and Florida. 
ExsiccaTi: Ellis N. Am. Fungi 1160; Ellis & Ev. Fungi Columb. 274; Seym. & Earle, Econ. 
Fungi 181. 
31. Phyllosticta maxima Ellis & Ev. Jour. Myc. 4: 123. 1888. 
?Phyllosticta Rhododendri Westend. Bull. Acad. Belg. 18°: 399. 1851. 
Spots large, irregular or semicircular in form, usually occurring on the margin or on the 
end of the leaf, often reaching a length of 4-5 cm., reddish-brown and distinctly marked 
with reddish zones, whitish near the center, visible on both sides of the leaf; pycnidia rather 
sparingly scattered over the infected spot, more abundant on the upper surface but some- 
times occurring on both, reaching a diameter of 120-150 4; spores rather large, ellipsoid or 
subfusoid, 5-7 X 15-20 p. 
On ERICACEAE: 
Rhododendron catawbiense Pursh, New Jersey. 
Rhododendron maximum L., Massachusetts. . 
Typr LocaLity: Bedford, Massachusetts, on Rhododendron maximum. 
DISTRIBUTION: Massachusetts, New Jersey, and Pennsylvania; also reported on Rhododendron 
nudiflorum? from Alabama, . ‘ 
Exsiccati: Ellis & Ev. N. Am. Fungi 2765. 
