146 



Mycologia 



The conidia borne on simple or sparsely branched sporophores 

 (text- fig. i) are hyaline or only very slightly colored as seen 

 under the microscope. In mass, however, the color is as variable 

 as that of the sporodochium — white, pink, yellow, amber, brown, 

 or blackish, depending upon the nature of the host, medium, 

 moisture, age or other conditions. The usual color when dry is a 



Fig. i. a. Various types of sporophores of Hainesia lythri. X 700. b. 

 Spores more highly magnified. X 1200. 



light amber. The terms lunate, allantoid, curved and navicular 

 have been used to describe their shape. Stevens & Peterson 

 (1916) say they are straight or slightly convex on one side and 

 concave on the other. Massalongo (1889) calls the pycnospores, 

 which are the same shape as the conidia, navicular, and his draw- 

 ings (I.e., pi. 10, figs. 19-2 t) suggest a boat or canoe viewed from 

 the side as it floats on the water. Others describe them as straight 

 with the ends sharply and obliquely angled. None has mentioned 

 the small oil droplet frequently attached to one or both of the 

 sharply pointed ends. 



The conidia are remarkably uniform in size and shape. The 

 average size is about 6-9 X i-5 -2 /*■ Saccardo's record (1881) 

 of 10-12 jm long for the spores of Gloeosporium? rhoinum is evi- 

 dently an error judging from the magnification indicated and also 

 from the spore measurements of Hainesia rhoina (Sacc.) Ell. & 

 Sacc, No. 2278, E. & E., N. A. F., the spores of which are 

 7-8 X 1.5-2 j". 



