(72) 



23, 26, 27, 31, Canthocampfus iUinoisensis, Forbes 



23. One of 5th pair of legs of female. 



26. One of anterior maxillipeds, X 250. 



27. One of 3d pair of legs of male. 

 31. One of posterior maxillipeds. 



24, 28, 29, 30, Diaptomvs sanguineus, Forbes. 



24. One of posterior maxillipeds. 



28. One of anterior maxillipeds, X 66. 



29. 5th pair of legs of male. 



29a. Tip of inner ramus of left leg. 



30. One of 5th pair of legs of female. 



PARASITIC FUNGI. 



PLATE I. 

 1, 2, 3 & 4, Cystopus candidus, Lev. 



1. Portion of cabbage leaf with spots and holes caused by 



fungus. 



2. Conidia, magnified 360 diam. After Cooke. 



3a. Oogonium; 3b, antheridium ; 3c, oospore, magnified 400 diam. 



4. Oospore (the developed oosphere) ruptured, exhibiting zoo- 



spores, magnified 400 diameters. After De Barry. 

 4a. Free zoospores from oospore. 3 & 4 after De Barry. 



5, 6, 7, 8, 9, 10 & II, Undetermined Parasite on Green-house Plants. 



5. Portion of petiole of geranium, with fungus; natural size. 



6. Fertile hyphae and conidia, magnified about 175 diam. 



7. Conidium magnified 650 diam 



8. Conidium twelve hours after sowing in water, outer coat rup- 



tured and the inner protrudng in the form of a tube, 

 magnified 32i) diam 



9. Same conidium, thirty hours after sowing, magnified 325 



diam. ; germinating tube issuing from two points. 



10. Supposed oospore, see text) magnified 390 diam. 



11. Longitudinal section of stem of Achyranthus, with mycelium, 



especially following the vascular bundles, a. Also seen 

 penetrating cells of pith, c. 



PLATE II. 



Melanispora populina, Lev, a, Portion of leaf of Populus monilifera, 



natural size ; b, Summer spores. 

 Botryopium pid(hrum{?') Corda. Magnified about 75 diam. 



