EXPLANATION OF THE PLATES. 
561 
Fig. 19. Spiral twisted embryo of Cuscuta europaea. 
Fig. 20. Half the embryo of a bean (Vicia Faba), after Mirbel ; a, one of the 
cotyledons ; h, plumula ; c, radicle ; d, scar from which the other cotyledon has 
been cut. 
Fig' 21. Germination of Lachenalia serotina ; «, albumen ; 6, cotyledon ; c, 
plumula ; d, radicle. 
Fig. 22. Germination of Calla aethiopica, after Mirbel ; a, exterior elongation of 
the cotyledon ; b, seed ; c, front leaf of the plumula ; d, radicle. 
Fig. 23. Germination of Allium Cepa ; a, albumen ; 6, embryo elongated be- 
yond the testa. 
Fig. 24. The same further advanced ; a, seed ; 6, base of the cotyledons ; c, 
radicle or young root ; d, plumula. 
Fig. 25. Germination of Baptisia australis, after De CandoUe ; a a, cotyledons. 
Fig. 26. Germination of Cercis Siliquastrum, after De Candolle ; a a, cotyledons. 
Fig. 27. Thecae, or Sporangiola of Erysiphe adunca, after Greville, 
Fig. 28. Sporules of Phascum crassinervium, after Greville. 
Fig. 29. Asci, or Thecas of Sphaeria tubjeformis, after Greville. 
Fig. 30. Thecae of various Lichens, after Von Martins. 
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