8 



Mycologia 



intense on the lower surface. Numerous black pycnidia open to 

 the upper surface. In severe cases half of the leaf tissue may 

 be involved. 



Phyllosticta congesta 



Maculis minutis, .5-8 mm. diam., brunneis numerosis, venis 

 limitatis; pycnidiis solitaris in quaque area, 50-125^ diam.; 

 sporulis globulosis vel leniter elongatis, hyalinis, 6-9 p. 



On Prunus sp. Boerne, 1554 {type). 



On the upper surface of the leaf are very numerous brown 

 areolae bounded by the veins of the leaf. The lower surface 

 may not be discolored. These minute spots fuse, and each con- 

 tains at its center a single black pycnidium. The pycnidia con- 

 tain globular or slightly oval, clear spores. 



Phyllosticta Verbesinae 



Maculis numerosis, griseis, suborbicularibus zona atrofusca 

 cinctis, 1-3 mm. diam. ; pycnidiis epiphyllis, 36-45 fi ; sporulis 

 oblongis vel ellipticis 4-6 X 2.5-3 fx. 



On Verbesina texana Buckl. Seguin, 2310 {type). 



This fungus produces gray or whitish subcircular spots, 1-3 

 mm. in diameter, surrounded by an indefinite darker zone which 

 fades out into the green tissue. 



Septoria marginata 



Maculis marginalis, effusis, dilute brunneis v. stramineis ; 

 peritheciis numerosis, amphigenis, brunneis vel nigris, 87-140 

 poro leniter pertusis, sporulis hyalinis, rectis saepe curvulis, 

 septatis, 40-60 X 2 -5~3 ft- 



On Rulac texana (Pax.) Small. Beeville, 1859; Lockhart, 

 2060; San Marcos, 21 13 {type) ; Luling, 2279; Seguin, 2286. 



The tips and margins of the leaves are killed, the dead areas 

 being brick-red, light-brown, or straw-colored, or nearly gray in 

 some cases, and confined to a narrow zone at the leaf tip or 

 margin or extending back until the whole leaflet is involved. The 

 advancing edge of the affected area is bordered by a narrow zone 

 of yellow. The disease results in a considerable amount of 

 defoliation with the appearance of having suffered from drought. 



The spore measurements are identical in size with Cylindro- 



