PLATE I. 



SWARMSPORES AND ZYGOSPORES. 



FORMS OF CHLOROPHYLL-BODIES. 



a — d Development of swarmspores in the tubular cells of Vaucheria clavata. 



e — h Swarmspores and resting-cells of "red-snow" (Sphaerella nivalis), mixed 

 with pollen-grains of Pines. 



i — k Forms of Chlorophyll in cells of Desmidieae (i. Closterium Leibleinii; 

 k. Penium interruption). 

 1 Formation of zygospores and spiral arrangement of Chlorophyll-bodies 

 in cells of Spirogyra arcta. 

 m Star-shaped Chlorophyll-bodies in cells of Zygnaema pectinatwm. 

 n — o Oloeocapsa samguinea. 



p Protonema of Schistostega osmundacea. 

 q Transverse section of the foliage-leaf of Cress. 

 r Transverse section of the leaf of the Passion-flower. 

 s Relative positions of laticiferous tubes and palisade-cells in the leaf 

 of a Spurge (Euphorbia Myrsinites). 



AH the figures greatly magnified. 



