UPON SCALE-INSECTS. 19 



Aschersonia, a. 



Fig. ^8. — Piece of leaf of a grass {Andropogon muricatus) 

 with black scales (Aleurodes) attacked by Aschersonia 

 s, scales without fungus; sp., scales partially covered with 

 fungus ; remainder st, scales completely covered with stro- 

 mata,the'dark dots representing the openings of the pycnidia. 

 Natural size. 



Fig. 29. — Detached stroma, being the largest one in fig. 

 28, h, hypothallus ; /), openings of pycnidia. x 5. 



Fig. 30. — Conidia. x 550. 



Fig. 31. — Piece of bamboo (Ochlandra) leaf with black 

 Aleurodes attacked by Aschersonia. s, scales without fungus; 

 st, stromata covering or partially covering scales, minute 

 dark dots representing openings of pycnidia. Natural 

 size. 



Fig. 32. — Detached siroina from fig. 21, side view, p, 

 openings of pycnidia. x 5. 



Fig. 33. — Leaf of Memecylon capitellatum (underside) 

 with pale Aleurodes attacked by Aschersonia and " brown 

 mealy wing fungus '': &, pustules of latter ; s, scales without 

 fungus ; st, scales covered with stromata of Aschersonia, 

 showing hypothallus and openings of pycnidia. Natural 

 size. 



Plate III. 



Fig. 34. — Vertical section of stroma of fig. 33 ; p, pycnidia; 

 Ji, hypothallus ; s, remains of scale, x 10. 



Fig. 35. — Section of stroma of fig. 33, showing c, con i dial 

 bearer with conidia and p, sterile hypha) (paraphyses). 

 x 100 (semi-diagrammatic). 



Aschersonia, b. 



Fig. 36. — Twig of Myristica moschata, showing numerous 

 large stromata covering scales of Leccwimn psidii. s, scales 

 without fungus. Natural size. 



