189) PARASITIC FVNGJ— STEVENS 23 



25. Phyllachora No. 3. 



Spot none, stromata small, punctiform, 1 to 1.5^ in diameter, black, 

 shining, visible from both sides of the leaf, both surfaces arched, with few 

 locules, usually 1 to 4. Clypei on both surfaces very thick and black, 

 epidermal and sub-epidermal. Locules 230 to 277/x in diameter or by 

 coalescence 550m. Asci 8-spored, long, narrow, 80 x 5.5/j, paraphyses hyaline, 

 filiform, crooked, gelatinous; spores uniseriate or inordinate, 11 to 12.5 

 X 4 to 5m, continuous, hyaline, oblong. 



On unknown dicotyledonous host. 



British Guiana: Coverden, August 4, 1922, 981. 

 Associated with Kusanoopsis Stevens and Weedon.* 



26. Phyllachora No. 4. 



[Figure 101.] 

 Spot pale, circular, constituting a zone 1 to 2 mm. wide around each 

 stroma. Stromata punctiform, about 1 to 3 mm. in diameter, black, visible 

 from both sides of the leaf, uniloculate. Clypeus epidermal, 30 to 46m 

 thick on both leaf surfaces. Locules about 300m wide, 154 to 185m deep. 

 Asci long, narrow, 68 to 7m. Paraphyses filiform, few. Spores uniseriate, 

 hyaline, continuous, ovate, 9 to 11 x 7m. 

 On unknown dicotyledonous plant. 



British Guiana: Wismar, July 14, 1922, Z7<5.; Kartabo,July 23,1922, 

 61S. 



27. Phyllachora No. 5. 



[Figure 55.] 



Spot small, 5 to 8 mm., yellowish. Stromata scattered, visible from 

 both sides of the leaf, usually unilocular, rarely bilocular, clypeus above 

 and below and frequently extending into the mesophyll to surround the 

 locule; about 30m thick, dense, black. Locules globular, 180 x 108m. Asci 

 8-spored, long, narrow. Paraphyses filiform, numerous. Spores continuous 

 hyaline, oval to elliptical, 11 x 7 to 8m. 



On unknown Legume. 



British Guiana: Coverden, August 8, 1922, 7S0: Tumatumari, July 

 8, 1922, 47: and July 10, 1922, J38. 



The clypeus develops first in the upper and lower epidermis, black 

 and dense, then often extends into the mesophyll completely surrounding 

 the locule by a black stroma quite like the clypeus, both in thickness and 

 character, (Figure 55). 



The fungus is clearly a Phyllachora and the only feature of special 

 interest is the manner in which the locule is enveloped. 



' Stevens, F. L. and Weedon, A. G. Three new microthyriaceaus fungi from South 

 America. Mycologia, 15:197, 1923. 



