EXPLANATION OF PLATE VI 



BASIDIOMYCETES 



FIGS. I, 2. Ustilago avenae (UsxiLAGiNALEs). Germinating chlamyd- 

 ospores producing spores laterally and terminally. X 350. (Redrawn 

 from Brefeld.) 



FIG. 3. Tilletia zonata (UsxiLAGiNALEs). Germinating chlamyd- 

 ospore producing a cluster of spores at the apex. X 300. (Redrawn 

 from Brefeld. ) 



FIG. 4. Urocystis violae (UsxiLAGiNALEs). Germination of a chlamyd- 

 ospore. X 180. (Redrawn from Brefeld. ) 



FIG. 5. Puccinia graminis (UREDiNALEs). Uredospore with separ- 

 able pedicel. X 200. (Redrawn from Sachs.) 



FIG. 6. Puccinia graminis (UREDINALES). Teleutospore. X 330. 

 Redrawn from Peck). 



FIG. 7. Puccinia anemones ( UREDINALES). Teleutospore. X 300. 

 ( Redrawn from Peck. ) 



FIG. 8. Puccinia podophylli (UREDINALES). Teleutospore. X 300. 

 ( Redrawn from Peck. ) 



FIG 9. Puccinia graminis (UREDINALES). Germinating teleutospore 

 producing the basidiospores from the upper part of the promycelium. X 

 330. (Redrawn from Sachs.) 



FIG. 10. Uromyces trifolii (UREDINALES). Teleutospore. X 375. 

 ( Redrawn from Dietel. ) 



FIGS, n, 12. Ravenelia cassiicola\ UREDINALES). Compound teleuto- 

 spores with long and short pedicels respectively. X 200. (Redrawn from 

 Dietel. ) 



FIG. 13. Triphragmium idmariae (UREDINALES). Teleutospore. X 

 250. (Redrawn from Dietel.) 



FIG. 14. Phragmidium mucronatum (UREDINALES). Teleutospore. 

 X 200. (Redrawn from Scribner.) 



FIG. 15. Pttccinia graminella (UREDINALES). Section across a grass 

 leaf showing a cluster cup (with the two cut portions of its pseudoperidium 

 projecting upwards) containing aecidiospores, together with teleutospores 

 (two-celled) rising from the same mycelium. X 150. (Redrawn from 

 Dietel. ) 



FIG. 16. Normal leaf of Hepatica acuta. FIG. 17, leaf from the same 

 plant distorted by Aeddium hepaticatum (UREDINALES). Both one-half 

 natural size. FIG. 18, a portion of the under surface of the leaf in Fig. 

 17 showing the crater-like cluster-cups with spermogonia scattered among 

 them. X 5. 



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