40 CRANBERRY DISEASES. 



of the medium was covered with a thick, loose layer of much-branched 

 hyphee. The vegetative hyphse frequently form strands of several 

 filaments closely united (PL V, fig. 8). 



The fertile hyphee were distributed over the surface and bore 

 conidia at the apex as well as at the sides (PI. V, fig. 4). These 

 conidia are somewhat elliptical and usually conspicuously inequilat- 

 eral (PI. V, figs. .5, G, 7). They are thick walled and from three to 

 five celled at maturity, all but the terminal cells, which are hyaline, 

 being of a deep-brown color. The conidia measure from 18 to 30 by 

 8 to 14 jx. In old cultures tufts or clusters of erect, slender, irregular, 

 somewhat branched, hard, black bodies 5 to 15 millimeters in length 

 are formed in great abundance, covering the surface of the culture 

 (PI. V, fig. 9). These appear to be of a sclerotoid nature. They have 

 never been found to bear fructifications of any sort. When broken 

 up and pieces are transferred to culture media, the mycelium grows 

 and soon produces conidia. So far as known this fungus is of infre- 

 quent occurrence and probably causes very little injury. It has not 

 been found in a fruiting condition upon fruit or vines in the field. 



Gloeosporiinn minus Shear.-* — Besides the Gloeosporium {Glomer- 

 ella rufomaciilans vaceinii), already described as causing the cran- 

 berry anthracnose, another has been found which has been published 

 under the above name. Onl}^ the conidial stage is known. All 

 efforts to produce an ascogenous form have thus far failed. 



The acervuli are amphigenous, small, and scattered, and do not 

 form a definite discolored spot on the leaf so far as observed. They 

 sometimes occur upon the berries. In such cases the epidermis is 

 dark colored above and about the acervulus. The conidia are dis- 

 charged through a rupture in the epidermis and form a pale pinkish, 

 glutinous mass. They are oblong-elliptical or subcylindric and some- 

 times inequilateral or somewhat clavate (PL III, fig. 11), and are 

 usually guttulate when fresh. They vary in size from 6 to 9 by 

 8 to 4 /x and are borne on simple, slightly tapering sporophores one 

 and a half to two times the length of the conidia. No setse have been 

 observed in any of the acervuli. 



The conidia of this species are only about one-half as large as 

 those of Glomerella rufomacidans vaccinii and show no great amount 

 of variation, either under natural conditions or in cultures. This 

 species is perhaps closely related to Gloeosporium myrtilli Allesch., 

 which has conidia 6 to 10 by 1.5 to 3 /i, and occurs on Vaccinium 

 inyrtiUurii in Germany. 



This fungus was first found on cranberries offered for sale in the 

 Washington market in April, 1902. It has also been found on 

 cranberry leaves from New Jersey and has been isolated from other 

 leaves from the same State. It is apparently of comparatively rare 

 occurrence and perhaps of little importance as a disease producer. 



110 



