274 Scientific Proceedinys, Royal t)uhlin Society 



Plate X. 

 J^ All figures x 510 diameters. 



FIG. 



1. Conidia of Polyspora lini from a naturally affected flax leaf. 



2. Conidia germinating on beef-extract gelatine ; twenty-four hours old 



culture. 



3. Same as 2 ; forty-eight hours old culture, new conidia being produced. 



4. Same as 2 and 3 ; seventy-two hours old culture. 



5. Vertical section through portion of an affected flax leaf, showing one 



conidiophore of P. lini protruding through a stoma, and producing 

 conidia. 



6. Portion of mycelium from a fifty-four-day old culture of P. lini on oat- 



extract agar, showing the production of conidia on minute lateral 

 outgrowths. 



7. Portion of section through the seed-coat of an affected flax seed, showing 



hyphae of P. lini in the outer layers of cells, and two conidiophores, 

 which have produced conidia on the surface. 



8. Conidia of P. lini produced within an empty cell of a hypha; from a 



fifty-four-day old culture on oat-extract agar. 



