92 Bulletin 313 



Septoria myrtCvE E. & ^^^ — On the leaves of Myrica cerifera. 

 Causes rust\--bro\vn frequently confluent spots about 3-6 mm. in 

 diameter on under surface of the leaf. Perithecia erimipent, black, 

 conical and with broad opening at apex. Spores slender, curved, 

 hyaline, 3-6 septate, 8-10 x 1.25 /x. 



544. Infected leaf of Myrica cerifera. 545. Spores, 1/12. 



Septoria xabali B. & C. — On the leaves of Nahalus albns. 

 Causes leaf spots. Spots, numerous, circular, oval or sometimes 

 irregular and confluent, white and surrounded by broad purplish 

 border; perithecia dark brown, globose, erumpent, 57-90 /x; spores 

 slender flexuose, 3-septate when mature, 20-36 x 2-2.5 fi. 



546. Infected leaf of Xahalus albns. 547. Pycnidia, 2/i. 54S. Spores, 1/12. 



Septoria petroselini var. Apii. Br. & Cav. — On celery. Causes 

 more or less circular, sometimes angular, spots on the leaves and 

 petioles. Spots on leaves about 1.5 cm. in diameter, drab to brown, 

 borders raised, frequently coalescing. Spots on petioles originate as 

 water-soaked areas. Pycnidia simple or compound, globose or ellip- 

 tical, 52-138 ^t; conidia cylindrical, fusiform, filiform or curved, 

 one end subacute, the other cylindrical, septa faint, nearly hyaline, 

 19.2-57.7 x 2.7-3.8 ^. 



549. Infected leaf of celery. 550. Pycnidia, 2/3. 551. Spores, 1/12. 



Septoria piricola Desm. (^ Mycospharella sentina (Ft.) Schr., 

 page 46). 



Septoria polygoxorum Desm.- — On leaves of Polygonum. 

 Causes small, circular brown spots with dark borders ; pycnidia 

 minute, pale brown, erumpent, concave at maturity; spores filiform, 

 2-4 septate, hyaline, 25 x 1 //. 



552. Portion of infected leaf of Polygonum sp. 553. Spores, 1/12. 



Septoria prunell.«* Ell & Holw. — On the leaves of Prunella 

 vulgaris. Causes dark brown or black spots of various shapes ; 

 pycnidia broad, prominent, scattered on upper surface of the spot, 

 dark, smooth, 100-130 fi; spores somewhat dark, clavate, narrow, 

 multi-septate, 40-75 x 1.5-2 fx. 



554. Infected leaf of Prunella vulagris. 555. Pycnidia, 2/3. 556. Spores, 

 1/12. 



♦Given in Saccardo, P. A., "Sylloge B'ungorum," as Septoria hrunellce. 



