182 ASC'OMVCKTKS. 



Suiitlicrn Europe and America. Sooty mould of the orange is 

 also ascribed to Capnodium citri Berk, et Desm.^ 



M. camelliae Catt. on Camellia jainniicn. According to- 

 Briosi and Cavara, this causes drying up of the leaves. 



Stemphylium ericoctomun Br. et Bary, tlie " sootv-ilew " of iiidoor lieatlis 

 is con.sidereil amongst the Hypliomyeetes. 



Lasiobotrys. 



L. lonicerae Kunze.- The perithecia form black masses on 

 green leaves of species of Lonicera. If these be removed the 

 epidermis remains uninjured, except for a slight cavity with a 

 lighter green colour than the neighl)0uring surface. 



Thielavia. 



Perithecia spherical and without an aperture. The asci 

 contain eight brown unicellular spores. Paraphyses absent, 

 Conidia and chlamydospores are formed. 



Thielavia basicola Zopf.^ This is the only species of the 

 Perisporieae which causes a really serious plant-disease. It is 

 allied to the Erysipheae, and produces three kinds of repro- 

 ductive organs on the underground parts of plants of Lupine t 

 (1) Cylindrical, delicate, hyaline chlamydospores, produced in 

 pistol-shaped branches of the mycelium. (2) Thick-walled, 

 brown-coated, resting conidia arranged several in a row, like 

 spores of a Plira/jwidrnm. (3) Perithecia, or little, spherical,, 

 permanently closed, brown structures with ovoid asci containing 

 eight brownish lemon-shaped spores. 



A white coating of the hyaline conidia is first formed, then 

 a brown coating of the dark conidia, and finally perithecia. 

 The mycelium bores through the cell-walls and fills first the 

 cells of the cortex, later those of the deeper parenchyma of the 

 ho.st-root. The disease of the root soon causes a stunting of 

 the shoots and leaves, finally death of the plant. The roots 

 attacked are at first brown, then they rot and become detached, 



' W. {}. Farlow, Bvll. Bimsey Inntihite, i. 1876, p. 404; Swingle and \Vt>))her, 

 "Diseases of citrous fruits," U.S. Dejtt. Agric. Bull. 8. 1896. 



-Jaczewski includes Lasiobofry.s with the Citcnrbitariaceae. 



•'Zopf, " Ueher die Wurzelbriiune d. Lupinen." Ze.itschri/t f. Pfianzmkratik- 

 heiten, i. p. 72. 



