UPON SCALE-INSECTS. 77 



EXPLANATION OF PLATES. 



(The figures all illustrate Ceylon specimens.) 



Plate I. 



TorruMella. 



Fig. 1. — Species 1 : Piece of leaf of Tetranthera with large 

 brown stroma on the white mycelial fringe of which are 

 borne deep pink perithecia/; ; also a small stroma without 

 perithecia with central pair of scale s (Aleurodes, sp.), 

 visible, x 5. 



Fig. 2. — Perithecium, x 20. Fig. 3, Ascus, x 320. 

 Fig. 4, Ascospore, x 320. 



Fig. 5. — Species 2 : Piece of leaf of a jungle tree with s. 

 .scales {Aspidiotus destructor) without fungus and p, peri- 

 thecia with coherent bases, x 5. 



Nectria. 



Fig. 6. — Piece of Citrus stem with scales of Aspidiotus 

 aurantii attacked by fungus in conidial stage: s, scale with- 

 out and sf, one with fungus. Natural size. 



Fig-. 7. — Detached scale of tig. 6 showing 7 sporodochia 

 (conidial heads) around it. x 10. 



Fig. s # — Detached scale of Ghionaspis bidavis showing 

 fungus in ascns-stage. p, perithecia ; sp, remains of a sporo- 

 dochium. x 10. 



Fig, 9. — Four sporodochia in the dry state, showing 

 various lengths of stalk, st ; .h, glutinous heads of conidia ; 

 p, young perithecia. x 20. 



Fig. 10. — A sporodochium expanded by water which"' 

 liberates the conidia ; p, young perithecia. x 20 (semi- 

 diagrammatic). 



