THE FUNGI WHICH CAUSE PLANT DISEASE 493 



one on snapdragon,^^ another on Clematis roots,** and one on ap- 

 ple*"^ 



Phomopsis Saccardo " (p. 482) 



As in Phoma, but with hooked conidiophores. A small genus. 



P. aloeapercrassee Trinch. is reported on scapes and flowers of 

 the aloe in Italy. 



P. stewartii Pk. 



Perithecia gregarious, commonly occupying grayish or brown 

 spots, thin, subcutaneous, at length erumpent, depressed, minute, 

 Is- 1 2 xaxsx. broad, black; spores of two kinds, first; filiform, curved, 

 flexuous or vmcinate, hyaline, 16-25 x 1-1.5 n, second; oblong or 

 subfusiform, hyaline, commonly binucleate, 8-12 x 2-3 /i; 

 sporophores slender, equal to or shorter than the spores. 



The fimgus with its filiform spores only was noted as a parasite 

 on Cosmos by Halsted who referred to it as a species of Phlyctaena.^* 

 It has been noted in New York by Stewart," and is destructive 

 both in the greenhouse and in the open. 



Macrophoma Berlese & Voglino (p. 481) 



As in Phoma, but the ostiole of the pycnidium not papillate, 

 and the pore smaller; conidia over 15 n long; conidiophores sim- 

 ple, short or filiform. 



About one hundred seventy-five species. 



M. hennebergii (Kilhn) Berl. & Vogl. causes a serious disease 

 on wheat in Sweden.*^ 



The fungus which appears in the literature as M. curvispora 

 Pk. is in reality Gloeosporium malicorticis, see 

 p. 542, and that referred to as M. malorum 

 is Myxosporium corticolum. See p. 546. 



M. vestita Prill. & Del. attacks cacao in 

 Ecuador. 



M. dalmatica (Thiim.) B. & V. parasitizes the ^^ 338.-1m. 

 olive: M. taxi B. & V. attacks the leaves of spora, spores. Af- 



tcr Oordicv* 



Taxus; M. abietis M. & H. is associated with 

 a fir disease; M. manihotis Hem. is on cassava; M. ligustica Mag- 

 nag on Hydrangeas; M. helicinia Magnag on ivy. 



a 



curvi- 



