EDGERTON: GNOMONIA 595 
14-19 X 3-5. They are two-celled, the two cells being equal, 
constricted at the septum, somewhat fusoid, quite often guttulate. 
Each end of the spore is continued into a long hyaline point, but 
this falls away very readily so that the end of the spore has a 
rounded appearance (FIG. 3@). Paraphyses are absent. 
Cultures of the ascospores were made in bean agar. The 
spores germinated readily by sending out a germ-tube at each 
end (FIG. 3¢). No germ-tube was seen coming from the side of 
the spore. A much-branched and septate mycelium resulted 
Fic. 2, Photomicrograph of a section of a perithecium of Gnomonia Rubi. 
which spread rapidly over the agar, forming a very thin sub- 
merged growth. Pieces of the agar were transferred to sterilized 
bean pods and blackberry stems. On_ both substrata, growth 
continued rapidly. In about ten to fourteen days, perithecia with 
the same appearance and structure as those originally found on 
the blackberry began to form. The only observable difference 
Was in the beak of the perithecium. This was much longer on. 
the perithecia formed in pure culture, and quite often it was bent 
back in the form of a hook near the apex. This same variation 
in the length of the beak in pure culture has been noticed by 
Klebahn * in another member of the genus, Gnomonia veneta 
aie er re ee ey *. wo? me 
*KLERAHN, H. Ueber einige Fungi imperfectt und die zugehérigen Ascomyceten 
f, 
Ormen. Jahrb. fiir wissensch. Botanik 41: 519. J: ¢ 
