104 



PLATE XIV. Transverse section through a bundle of the 

 petiole of Polypodium vulgare, L. 



PLATE XV. Part of a transverse section through a three-year- 

 old twig of Tilia parvifolia, Ehrb. 



PLATE XVI. Transverse section through a bundle from the 

 stem of Cucurbita Pepo, L. 



PLATE XVII. Longitudinal section 0f the growing apex of a 

 root of Secale cereale, L. 



PLATE XVIII. Transverse section through a developed 

 embryonic root of Secale cereale, L. 



PLATE XIX. Development of tfie ovule of (Enothera bien- 

 nis, L. 



PLATE XX. Median transverse section of the ovule of Viola 

 tricolor, L., immediately after fertilisation. 



PLATE XXI. Development of Peronospora caloiheca, de 

 Bary. 



PLATES XXIL, XXIII. Development of Mucor Mucedo, L. 



PLATES XXIV., XXV. Development of Puccinia graminis, 

 Pers. 



PLATES XXVI.-XXVIII. Reproduction of the Floridese: 

 Nemcdion multifidum (Web. et Mohr) ; Lejolisia mediterranea, 

 Boraet ; Dudresnaya coccinea (Poir.). 



PLATE XXIX. Development of the apex of the stem of Hip- 

 purls vulgaris, L. 



PLATE XXX. Development of the apex of the stem of Elodea 

 canadensis (Rich, et Mich.). 



PLATE XXXI. Development of Rivularia bullata (Poir.). 

 PLATES XXXIL, XXXIII. Development of Eurotium. 



PLATES XXXIV., XXXV. Development of Penicillium 

 crustaceum (L.), Fries. 



PLATES XXXVI.-XXXVIII. Development of the Fucacece. 

 Apical growth of Pelvetia canaliculata, Thur. ; fertilisation 

 of Fucus vesiculosus, L. 



PLATE XXXIX. Heterosfcylic dimorphism of the flowers of 

 Primula elatior, Jacq. 



PLATE XL. Heterostylic trimorphism of the flowers of Lyth- 

 rum Salicaria, L. 



PLATES XLI.-XLIV. Development of Claviceps purpurea 

 (Fries.). 



PLATES XLV.-XLVIII. Development of Botrydium granu- 

 latum (L.). 



PLATE XLIX. Transverse section of a vascular bundle with 

 two separate tracts of soft bast from the median portion of a 

 leaf-stalk of CTiamcerops humilis, L. 



