EXPLANATION OF PLATE VI 



Basidiomycetes 



Figs, i, 2. Ustilago avenae {\J?,Ti-LA.Giy.A.i.Y.s). Germinating chlamyd- 

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

 from Brefeld.) 



Fig. 3. Tilletia zonata (USTILAGINALES). Germinating chlamyd- 

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

 from Brefeld. ) 



Fig. 4. Urocystis violae (Ustilaginales). 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 graniinis (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 [Uredi'N ales). 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, ii, 12. Ravenelia casmcola{\}'RY.V)\^K\:¥J~>). Compound teleuto- 

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

 Dietel. ) 



Fig. 13. Tf'iphragniium ulmariae (Uredinales). Teleutospore. X 

 250. (Redrawn from Dietel.) 



Fig. 14. Phragmidium mucronatum ( UREDINALES ). Teleutospore, 

 X 200. (Redrawn from Scribner. ) 



Fig. 15. Puccinia graininella i^'&.E'omM.Ys). 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 hy A ecidium 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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