120 Bulletin 313 



729. Part of infected leaf of Plantago lanceolate. 730. Conidiophores and 

 conidia, 1/12. 



Ramularia taraxaci Karst.— On the leaves of Taraxacum tar- 

 axacum. Causes grayish-brown circular spots with purple margins 

 on both surfaces of the leaves and shows concentric circles. Conidi- 

 ophores borne in tufts on the under surface of the leaf, branched, 

 non-septate, hyaline, 35-45 x 2-3 /*; conidia cylindrical, usually 

 1-celled, occasionally 1-septate, hyaline, 18-30 x 2-3 fi. 



731. Part of infected leaf of Taraxacum taraxacum. 732. Conidia, 1/12. 



Ramularia tulasnei Sacc. (= Mycosphcerella fragarics (Tul.) 

 Lin., page 44). — On leaves of strawberry. Causes white or gray, 

 more or less circular spots with broad dark-red margins. Conidio- 

 phores cylindrical, non-septate, hyaline, 30 x 3-4 /*; conidia cylin- 

 drical, non-septate or 1-2 septate, hyaline, 20-35 x 3.5-4.5 fx. 



733. Infected strawberry leaflet. 734. Conidia, 1/12. 



Piricularia grisea (Cke.) Sacc. — On leaves and stems of 

 grasses. Causes grayish or ashy-colored spots. Conidiophores rise 

 from stomata in clusters of 2 or 5, grayish in color, septate, simple, 

 occasionally sparingly branched ; conidia single, terminal in scor- 

 pioid cymes, ovate, 2-septate, 24-29 x 10-12 fi. 



Very similar to P. oryzae Br. & Cav. which causes the rice blast. 



735. Infected leaf of grass. 73'6. Conidiophores and conidia, 1/12. 



MoNiLOCH^TEs iNFUSCANS E. & H. — On the fleshy roots of the 

 SM^eet potato. Causes peculiar dark discolorations. Conidiophores 

 attached to host singly or by twos by a bulb-like enlargement, erect, 

 unbranched; septate, dark, 40-175 x 4-6 /x; conidiospores unicellular 

 oblong, hyaline, 12-20 x 4-7 ix. 



737. Infected root of sweet potato. 738. Conidiophores showing swollen 

 cells and conidia, 1/12. 



Cercosporella cana (Pass.) Sacc. — On leaves of Erigeron cana- 

 densis. Causes whitish spots. Conidiophores on the under side of 

 the leaf, cylindrical, occasionally septate, short, obtusely branched. 

 Conidia cylindric obclavate, 3-4 septate when mature, minutely gut- 

 tulate, slightly curved, hyaline, 60-90 x 4-5 /x. 



739. Conidiophores, 1/12. 740. Conidia, 1/12. 



