624 THE FUNGI WHICH CAUSE PLANT DISEASE 



tomato and potato, the spots appeared in eight or ten days after 

 inoculation. Jones, using pure cultures, confirmed the conclu- 

 sions of Chester and Galloway, the disease spots appearing as early 

 as the third to fifth day after inoculation on vigorous iminjured 

 leaves. The mycelium grows luxuriantly within the leaf but spores 

 do not usually form until after the death of the supporting tissues 

 when the conidiophores emerge through the stomata or by ruptur- 

 ing the epidermis. Often no spores are formed and rarely are 

 many present. The myceliimi may live a year or more and resume 

 sporulation the following season. 



A. fasciculata (C. & E.) Jones & Grout."*' ^^' ''«• ^^ 



Conidiophores light or dark-brown, becoming almost black, 

 darker than the vegetative hyphaj but like them echinulate, 

 30-40 X 4r-5 n; conidia concolorous with the conidiophores, 35-66 

 X 16-20 n, obclavate, 3 to 6 times cross-septate, 1 to 2 longi- 

 tudinal septa, apical cell hyaline. 



This fungus is associated as a saprophyte with the blossom- 

 end-rot of tomatoes and also causes a serious decay of the ripened 

 fruit. The literature of the disease is rather voluminous and con- 

 tains a number of synonyms, among them Macrosporium tomato. 

 M. lycopersici, M. rugosa, M. fasciculata. Altemaria solani has 

 also been credited with this disease and indeed the two species 

 may be identical.''* 



A. fici Far, is on figs; 



A. tabacinum Hori on tobacco;" 



A. vitis Cav. on Vitis. 



An undetermined Altemaria accompanied by a Macrosporium 

 was constantly found in Nevadillo bianco olives which were 

 shrivelled, particularly at the apex. 



These fxmgi were regarded as the cause of the disease.'** 



Fumago Persoon (p. 616) 



Hyphae decumbent, mtricate, frequently pseudo-stromatic, 

 black; conidiophores, erect, branched; conidia ovoid, oblong or 

 sarcinffiform, 1 to 2-septate. 



A small genus, chiefly conidial forms of Capnodium and Meliola. 

 See pp. 192, 193. 



