80 Bulletin 313 



CoNiOTHYRiUM coxcENTRicuM (Dcsni.) Sacc. — On the leaves of 

 Yucca and Agave, causing spots and dying of the tips. Spots cir- 

 cular or oval, or irregular, frequently confluent, yellowish, ashy, 

 surrounded by a broad, dark, regtilar to irregular border; pycnidia 

 concentrically depressed, dark, spores globose to ovoid, hyaline, bj- 

 coming yellowish and finally fuliginous, 4-5 x 3-4 fi. 



448. Infected tip of Yucca leaf. 449. Spots on the leaf of Agava sp. 450. 

 Pycnidium, 2/3. 451. P3'cnidia with spore tendrils, 2/3. 452. Cross-section of 

 pycnidium from Yucca, 2/3. 453. Spores from Yucca, 1/12. 454. Spores 

 from Agava, 1/12. 



CoNiOTHYRiUM FUCKELii Sacc. (= LeptospJiccria coniothyriiim 

 (Fcl.) Sacc, page 48). — On raspberries and roses. Causes a blight- 

 ing and dying. The bark peels from the diseased part showing the 

 small black pycnidia. (Pycnidia will also form on cut surfaces of 

 canes in the moist chamber.) Pycnidia scattered, subcortical, 

 erumpent globose-depressed, 180-200 /x; conidia numerous globoee 

 or slightly elliptic, those on raspberry measuring 2.5-4.4 x 2-3 /x, 

 those on rose measuring 3-5 x 2-3.3 fi. 



455. Infected cane of rose. 456. Pycnidium from leaf with emerging 

 spores, 1/12. 457. Spores from same, 1/12. 458. Germinating spores, 1/12. 

 459. Pycnidium from leaf, 2/3. 460. Spores from same, 1/12. 461. Pycnidia 

 from cane, 2/3. 462. Cross-section of same, 2/3. 463. Same, 1/12. 464.' 

 H^-menium from same, 1/12. 465. Spores from same, 1/12. 466. Germinating 

 spores, 1/12. 



CONIOTHYRIUM OLiVACEUM Ron. grmidiflorae Sacc. — On the 

 leaves of magnolia. Causes gray to brown circular or almost cir- 

 cular, sometimes irregular spots with definite margins, 1-5 mm. in 

 diameter. Pycnidia on the lower surface, globose, dark, about 

 100 /i in diameter; spores oblong or elliptical, olive-brown, 5-7 x 

 3-4 ,x. 



467. Spores. 1/12. 



CONIOTHYRIUM PLATANi Sacc. — On the under surface of the 

 leaves of sycamore. Causes brown blotches visible on both sur- 

 faces. Pycnidia black, globose, erumpent. Spores very small, 

 olivaceous to brown, unicellular, oval or nearly spherical, 3-3.5 x 

 2-3 fx. 



468. Spores, 1/12. 



