14 ILLINOIS BIOLOGICAL MONOGRAPHS [180 



ascigerous material is found only once in Stevens' Trinidad or Guiana 

 material, specimen No. 972. Specimen No. 223 has the general appearance 

 of Bagnisiopsis peribebuyensis and in section the structure of the stroma 

 agrees with that species. No asci, however, are found in any of the stromata, 

 but instead, numerous cavities bearing filiform conidia are found. Similar 

 conidia are in specimen No. 972. Search through literature has failed to 

 reveal to us any evidences of previous mention of a conidial stage of this 

 fungus. The presence of asci in the same stromata with the conidia is 

 sufficient to establish the identity of this conidial form with Bagnisiopsis 

 peribebuyensis and we therefore describe the conidial stage of it as follows: 

 Stroma as described for B. perihebuyensis.^ Conidial locules 0.05 to 0.15 

 mm. in diameter. Conidia colorless, crooked, filiform, 21 to 29 x 1 to 



Amerodothis Theiss. and Syd. 



Ann. Myc, 13; 295, 1915. 



6. Amerodothis guianensis Stevens n. sp. 

 [Figures 17 to 19, 90.] 



Spot irregular, pale, mycelium within the veins and producing loose 

 stromata within the cortex which later become erumpent, superficial por- 

 tion brown to black and of Dothideoid character. Stromata on the veins 

 solitary or scattered, amphigenous, black, bearing few to several locules. 

 Locules, ostiolate, papillate, 90 to 170/li in diameter. Asci 61 to 94 x 7/i, 

 clavate, aparaphysate, spores 21 to 65 x 2//, hyaline, filiform, continous, 

 straight or slightly crooked, with a small knob at each end. 



On unknown legume. 



British Guiana: Rockstone, July 16, 1922, 424. 



The spot is very variable in size and shape consisting of pale to yellow 

 regions between the aflfected veins, often 2 cm. or more in extent. Re- 

 cently affected veins are without stromata but are slightly discolored 

 due to the mycelium within, and the adjacent parts of the lamina 

 are pale and sickly. In older portions the stromata are crowded, in younger 

 parts they occur singly. While the erumpent stromata are often clearly 

 Dothideoid, i. e. of palisade cell arrangement and erumpent, this character 

 is not so pronounced as is often the case, indeed at times the cell arrange- 

 ment is quite irregular. Still it appears to me that the fungus should be 

 placed in the Dothideae where it comes nearest to Amerodothis in which 

 genus I place it. Four species are given by Theissen and Sydow all of 

 which are very different from mine in spore dimensions and shape and 

 especially do they disagree with the spores of my species as regards the 

 knobbed ends. Each locule is surrounded by a definite wall and in young 



•Ann. Myc, 13:292, I'JIS. 



' Notes and description by Stevens and Manter. 



