182 ASCOMYCETES. 



Southern Europe and America. Sooty mould of the orange is 

 also ascribed to Capnodium citri Berk, et Desiu. 1 



M. camelliae Catt. on Camellia jcqnmira. According to 

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



Stemphylium ericoctonum Br. et Bary, the " sooty -flew " of indoor heaths 

 is considered amongst the Hyphomycetes. 



Lasiobotrys. 



L. lonicerae Kunze. 2 The perithecia form black masses on 

 green leaves of species of Lonici./-a. If these be removed the 

 epidermis remains uninjured, except for a slight cavity with a 

 lighter green colour than the neighbouring 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. 3 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 : 

 (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 Pliragmidium. (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 

 host-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. 



1 W. G. Farlow, Bull. Bu**fy In*/i/)i/t, i. J876, p. 404; Swingle and Webber, 

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

 - Jaczewski includes Laxiobotryx with the Cucurbitariaceae. 



'Zopf, " Ueber die Wurzelbraune d. Lupinen." Zeitschrift f. Pflanzenkrank- 



li < iii "it, i. p. 72. 



