CL ADOSPO RIUM. 511 



CI. Scribnerianum Tav. On leaves of Betula populifolia in America 

 and Italy. 



CI. hypophyllum Fuck. On leaves of Ulmus campestris. 



CI. tuberum Cooke. In the tubers of Batatas edulis in Carolina, U..S.A. 



3. Sect. PiiRAGMosroRAE. 



Clasterosporium. 



Conidia brownish, cylindrical or spindle-shaped, and consisting 

 of three or four cells. 



Clasterosporium amygdalearum (I'ass.) attacks the leaves of 

 almond, peach, apricot, cherry, and plum. An intercellular 

 mycelium has been found, and roundish dry spots with reddish 

 margins are formed. Thereon tufts of short conidiophores are 

 developed, bearing cylindrical, thick-walled, pluricellular conidia. 



CI. glomerulosum Sacc. {Sporidesmium glom. Sacc, 1878, and 

 Fleo-s/Hi/'o coiKjInfinata Goebel, 1879). GoebeP first described 

 this species as a parasite on Juni-pcrus communis. A colourless 

 intercellular mycelium is present, and in consequence the 

 needles turn brown, die, and fall off 

 prematurely. On the upper side of 

 the needle the mycelium emerges 

 through the stomata, and forms 

 dark-grey coils from which the 

 grey, ovoid, pluricellular conidia are 

 given oft'. 



Ceratophorum. 



Conidia brownish, spindle-.shaped 

 or cylindrical, three or more celled, ^JX S<^,^:;"'''& with'Ts'LeS 

 the upper cell with terminal ^^ 5Kir=-.)"'^' ''' 

 bristles. 



C. setosum Kirch. Dark spots occurring on the leaves, 

 petioles, and shoots of young plants of Cytisus Laburnum, etc., 

 were found to enlarge and bring about death and defoliation. 

 Kirchner found the leaf-tissue permeated by a colourless septate 

 mycelium, which gives oft" conidia on both sides of the leaf. 

 The conidia resembled those of Pcstalozzia, but their cell-number 



' Wurtemhurg jiaturirits. Jahreshe/le, 1879. 

 Zdtfichrift f. Pftanztnkrankhtitm, 1892, p. .324. 



