New YorRK AGRICULTURAL EXPERIMENT STATION. 237 
* Didymium difforme (Pers.) Duby. On stems. 
Diplodia eleospora Sace. On stems. Syll. Fung. 3:369. 
D, medicaginis Brun. On stems. Syll. Fung. 10:289. 
* Diplodina medicaginis Oud. On stems. Syll. Fung. 18:351. 
* Fusarium sp. On stems and roots. (See page 221). 
* Haplographium toruloides (Fres.) Sacc. On stems. Rabh, Krypt. Flora. 
Bd. I., Abt. 8:696. 
Hendersonia circinans Sacc.™” On root and stems. Syll. Fung. 3:431. 
Lestadia tnsidiosa Massee. On leaves. Syll. Fung. 17:574. 
Leptospheria circinans (Fckl.) Sacc. On roots. Syll. Fung. 2:88. 
L. medicaginis (Fckl.) Sacc. On stems. Syll Fung. 2:19. 
L. medicaginum Sacc. On stems. Syll. Fung. 2:35. 
L.. pratensis S. & Br. On stems. Syll. Fung. 9:768. 
Leptothyrium medicaginis Pass. On stems. Syll. Fung. 3:634. 
L, vulgare (Fr.) Sacc. On stems. Syll. Fung. 13:711. 
* Macrosporium commune Rbh. On leaves. 
Melanomma dubiosum Sacc. On stems. Syll. Fung. 13:711. 
Microdiplodia medicaginis Diedicke. On stems. Syll. Fung. 18:325. 
Orbilia medicaginis Fautr. & Roun. On stems. Syll. Fung. 11:420. 
Phoma anceps Sacc. On stems. Syll. Fung. 3:120. 
P. herbarum West. On stems. Syll. Fung. 3:133. 
P. roseola Desm. On roots. Syll. Fung. 11:4809. 
P. vulgaris Sacc. On stems. Syll. Fung. 3:1109. 
* Pionnotes rhizophila (Cda.) Sacc. On roots. Syll. Fung. 13:712. 
Pleospora herbarum (Pers.) Rabh. On stems. Syll. Fung. 13:712. 
Pyrenocheta penicillata Fckl. On stems. Syll. Fung. 3:220. 
Rhabdospora allantoidea (B. & C.) Sacc. On stems, Syll. Fung. 3:586. 
* Torula sp. On stems. 
Trichopesiza sulphurea (Pers.) Fckl. On stems. Syll. Fung. 13:712. 
*Voluwtella gilva (Pers.) Sacc. On stems. Syll. Fung. 13:712. 
One of the species listed above, Diplodina medicaginis, was given 
considerable study. An alfalfa field at Geneva seeded in the spring 
of 1906 went into its first winter with a growth about a foot in 
height. The following March the dead alfalfa stems (which were 
still standing upright) were thickly covered with the black pycnidia 
of Diplodinia medicagimis. A similar condition was found in sev- 
eral other alfalfa fields. The fungus appears to be an exceedingly 
abundant one. 
The pycnidia are erumpent, membranous, distinctly ostiolate and 
100 to 200 v in diameter. On March 26 mature spores were 
abundant. When the pycndia are placed in water the spores exude 
through the ostiolum in rope-like masses. The spores are hyaline, 
10-17 X 3-4», Straight or slightly curved, rounded at the ends and 
#8 According to Fuckel (Bot. Ztg. 1861, p. 251 and Symb. Myc. p. 142) 
Hendersonia circinans is the pycnidial form and Leptospheria circinans the 
ascigerous form of Rhizoctonia megicaginis DC. 
