THE FUNGI WHICH CAUSE PLANT DISEASE 355 



Teliospores 2-celled 16. Gymnoconia, p. 359. 



Teliospores 3 or more-celled. 



Without uredinia 17. Xenodochus, p. 361. 



Without aecia 18. Kuehneola, p. 361. 



Sori all subepidermal; secia when 

 present with a peridium; ure- 

 dinia when present with no 

 peridium or rarely with en- 

 circling paraphyses. 

 Teliospores embedded in a more 



or less gelatinous matrix . . 19. Gymnosporangium, p. 361. 

 Teliospores not embedded in a 



gelatinous matrix. 



Teliospores colorless 20. Eriosporangium. 



Teliospores colored 



Tehospores 1-celled 21. Uromyces, p. 371. 



Teliospores 2-celled 22. Puccinia, p. 375. 



Hemileia Berkley & Brown (p. 354) 



Cycle of development imperfectly known; only uredinia and 

 telia recognized, both subepidermal. 



II. Uredinia formed beneath the stomata, erumpent, without 

 peridium or paraphyses, spores borne singly on short pedicels, 

 which arise from a protruding hymenium of agglutinated hjrphse, 

 obovate, laterally flattened and dorsiventral; wall pale-yellow, 

 smooth on ventral side, papillose on dorsal side, pores obscure or 

 absent. 



III. Telia replacing the uredinia. Spores borne singly on pedi- 

 cels, 1-celled, napiform; wall nearly or 



quite colorless, smooth. ^ 



H. vastatrix Berk. & Br. 



II. Hypophyllous, thickly scattered, 

 or rarely somewhat circinate, very small, ^^^^ r 



about 0.1 mm. across, light-orange fading ^^ 257.-Heimleia vasta- 

 to pale-yellow, pulverulent, projecting trix, a. uredinium; c 



^ •' ' ^ 1 i • teliospore. After Dietel 



through stomata and rarely ruptxmng and Ward. , 

 the epidermis; spores bilateral, slightly 



obovate, flattened on the ventral side, 20-28 by 30-40 n; wall 

 pale-yellow, 1-1.5 m thick, rather thickly and very coarsely papil- 



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