399 



Fig. 23. Germination of Allium Cepa : a, albumen ; b, embryo elongated beyond 



the testa. 

 Firj. 24. The same further advanced: , seed ; b, base of the cotyledons; c, 



radicle or young root ; d, plumula. 



Fig. 25. Germination of Baptisia australis ; after De Candolle : a a, cotyledons. 

 Fig. 26. Germination of Cercis Siliquastrum ; after De Candolle : a a, cotyledons. 

 Fig. 27. Thecse, or Sporangiola, of Erysiphe adunca ; after Greville. 

 Fig. 28. Sporules of Phascum crassinervium ; after Greville. 

 Fig. 29. Asci, or Thecso, of Sphseria tubseformis ; after Greville. 

 Fig. 30. Thecse of various Lichens ; after Von Martius. 



