94 



MISSOURI BOTANICAL GARDEN. 



Primary Conidia. 



Primary conidia are elliptical, resembling in appearance 

 and form the secondary conidia. They are hyaline, and 



measure 3.5/j, by 1.5ft, av- 

 erage, in size (pi. 7, f. 9, 

 10). They are borne term- 

 inalty on alternately branch- 

 ed, hyaline hyphae, and fall 

 together in large, spherical, 

 mucilaginous heads. The 

 heads vary in color from a 

 white to a dingy yellow. 

 They measure, with the 

 mucilaginous drop, 20ft to 

 500ft in diameter. The 

 stalks vary from gray to 

 brown or black, and measure 

 from 1 mm. to 2 mm. in 

 length, and 10ft to 40ft in 

 diameter. They are usually 

 solitary at first, but later may 

 become gregarious, or even 

 branched, especially in older 

 cultures where a secondary 

 growth has taken place. 

 In the study of this species several instances were noted 

 where hyphae bearing the secondary conidia branched 

 directly from filaments connected with the heads bearing 

 the primary conidia, thus giving additional proof of the 

 relation between the two forms of fruiting. (See figure). 



G. HIGIDUMj x 50 - 

 Stroma, with conidiophores. 



2 , Species with secondary conidia borne either in simple 

 clusters or in clusters of short branched chains. 



Gra phium aureum n. sp. 

 The first species of Graphiwn differing in conidia! forms 



