4:16 Agricultural ExPERIME^fT Station, Ithaca, N. Y. 



tei-s of the fruiting threads of Cerco>spora Apii are shown at a and 

 b in Fii?. 5, wliile c repi-esents a single fruiting thread with a spore 

 still attached, and free »ix>res are shown art: d and e. 



The fungus was first described by Fresenius.* The description 

 gi^en by Saccardo§ repi-eeients the form developed under normal 

 conditions, the hyphae measuring 40—60x4^—5 and the spores, or 

 con'idia, 50—80x4. The form of the conidia is given as obdavate, 

 i. e., the base or end at the point of attachment with the hyphae 

 is greater in diameter tlian the d^al extremity. The conidium in 

 sitn at the end of the hj-pha. Fig. 5, c, shows this character well. 

 It was also observed in mmierous other cases. Furthennore the 

 free or abjointed conidia nearly always pi-esent a well defined scar 

 at the larger end as shown in d and e, Fig. 5. This scar iijdicat^ 

 the place of ivttachment to tlie hypha^ the con-esponding scar on 

 the hypha b(4ng at the end or at one of the geniculations as shown 

 in a and b, Fig. 5. The explanation of several seal's appearing on 

 a single hyplia is that after a conidium is abjointed from the end, 

 the hypha then grows out at one side of the scar and bears anothei' 

 conidium at the end, and so on. These scars at the base of the 

 conidia enable one to determine their form even when they are 

 not attached to their parent hyphae. 



In the report of the mycological section** for 188(5 is a short 

 note on the distribution of this fungus in the Unitwl States. The 

 foiiu of tlie conidia is not given in the text, but they seem to be 

 inverted in the illustration where they are shown to be attached 

 by their small ends to the hyphae. Figuring them thus is equiva- 

 lent to calling them clavate with reference to their relation to the 

 hyphae which is contrary to the original descriptions an.d also to 

 fact. 



In the report of the New Jersey station for 1891 (1- ^•) ^l^*' 

 conidia are described as club-shaped. No figure is given and we 

 infer that the writer used the term " club-shaped " without any 

 reference to their relation to the hyphae. 



* Beitrage zur Mykologie, Frankfurt, 1850-1860. 

 § Sylloge Fungorum, Vol. iv, p. 443. 

 ** Report, Department of Agriculture. 



