90 Bulletin 313 



Septoria dianthi Desm. — On the leaves of cultivated Dianthus. 

 Causes yellow, long, circular or irregular spots; pycnidia pear- 

 shaped, depressed, blackish, ostiolate; spores in tendrils, elongated, 

 cylindrical, curved, 1-2 septate, one end slightly larger than the 

 other, hyaline, 30-45 x 4 /*. 



528. Infected stems of Dianthus sp. 529. Pycnidia, 2/3. 530. Spores, 1/12. 



Septoria erigerontis B. & C. — On the leaves of Erigcron sp. 

 Causes dark-brown circular spots with raised margins, visible on 

 both surfaces, sometimes confluent, 3-4 mm. ; pycnidia numerous, 

 grayish-brown or black, erumpent, ostiolate, 63-105 ix; spores hya- 

 line, filiform straight or slightly curved, attenuated at one end, 

 non-septate, 30-45 x 1-1.5 /*. 



531. Infected leaf of Erigeron sp. 532. Pycnidium, 2/3 533. Spores, 1/12- 



Septoria lactuc^ Pass. — On the leaves of lettuce. Causes ir- 

 regular, angulated, brownish spots and frequently destroying the 

 entire leaf. Pycnidia scattered, minute, punctiform and about 90 n 

 in diameter. Conidia filiform, straight or curved, 25-30 x 1.7-2 ,jx. 



534. Pycnidia, 2/3. 535. Spores, 1/12. 



Septoria lobeliae Peck. — On the leaves of Lobelia inflata. 

 Causes orbicular or oval, often confluent, dry, pale or light yellowish- 

 brown spots sometimes with dark or browninsh-purple margins. 

 Pycnidia on both surfaces, minute, numerous, dark, brown ; spore 

 tendrils white, spores hyaline, 1-3 septate, filiform, 17-27 x 1 )U. 



536. Infected leaf of Lobelia inflata. 537. Pycnidia, 2/3. 538. Spores, 1/12. 



Septoria liquidambaris C. & E. — On the leaves of Liquidambar 

 sfyraciflua. Causes suborbicular brown spots about 1-2 mm. in 

 diameter. Pycnidia on the under side of the leaf, prominent, clus- 

 tered, ostiolate, sub-globose, 80 /x in diameter ; spores hyaline, curved 

 ends, 3-5 septate, 55-60 x 3 ju. 



539. Infected leaf of Luquidamharis styraciflua. 540. Spores, 1/12. 



Septoria lycopersici Speg. — On the leaves and stems of the 

 tomato. Causes numerous small black spots followed by a yellow- 

 ing, dying and falling of the entire leaf. Pycnidia scattered, promi- 

 nent and membranous; conidia elongate, cylindric, many septate, 

 70-110 X 3.3 /x. 



541. Infected tomato leaf. 542. Cross-section of pycnidium, 2/3. 543. 

 Spores, 1/12. 



