NKi 1KIA 



I'.erlin. Paris, Kew. (.lasnevin 



189 



(Dublin), and 



of Breslau, 

 Edinburgh. 



Nectria ipomoeae Hals. 1 St.-ni-rot of cuu-plant and BWI 

 potato. In America this attacks yi.un- -.rowing plants, ami 

 causes stem-rot. The /Vx^/-/////* -stage develop.- as a white 

 mouldy coating on the withered stem, and is followed later 

 by flesh-coloured dusters of peritheda. 



% 



Polystigma. 



On the leaves of specie- ,,f Promts, one tinds bri-ht-col,, U red 

 spots, these are the stromata of this family, and in them 

 are embedded pycnidia containing hook- 

 shaped conidia. IVrithecia embedded 

 in a similar manner are developed 

 after ihe fall of the leaves, they contain 

 asci with eight unicellular elliptical 

 Spores, which are expelled on reaching 

 maturity in .-priiu. 



Polystigma rubrum (Pers.) d'.ritain 

 and I'.S. America). Thi.- appear.- as red 

 circular spots .m tin- leaves of plum ami 

 sloe. Mien, pycnidia are developed in 

 summer on the under-surface of ihe leaf 

 and give rise to curved conidia. The 

 perithecia be-in their development in 

 summer, but only reach maturity in the 

 following spring, after the Leaves ha\e 

 fallen from the tree and lain on the 

 -round over \\intei. The asci are club- 

 shaped, long-stalked, and contain ddit 

 spore-, which are set free in succession 

 from April to.lune. < ierminat ion ensues 

 on young leaves, and in six weeks 

 pvcnidia rea]i],ear. A variety, " .1 in ;/<i<l<il i I >esm.." is found .>u 



tin- Leaves of the almond (Atn/ygdalus <<//// ////////'x>. 



Frank ami l-'i-dt found in connection \\ith /'. //'/<//'///. 

 ceitain hyphae which they designate as brichogynes, while 



they re-ard tin- -mall form of conidia a- -perm. ilia which 

 I ' - -i -ipt iin ami illustration! in A". ./ r </ .!//< . /.'.'/ r. Statioi / 



i-'i'.. 



"n i ! ii" "i 1'iniii. i 

 

 i 

 iii.. n i 



i tin up) 

 "f 111.- l,-;if. (v. I :'.-!.) 



