PLATE LXIV. 

|50 Mic RONS 
Figs. 624-630. Different positions of operculum in operculate oogonia of 
Oedogonium. 624, supreme; 625, superior; 626, supramedian; 627, median; 
628, inframedian; 629, inferior; 630, infimus (basal). 
Figs. 631-635. Different positions of pore in poriferous oogonia of Oedogonium. 
631, superior; 632, supramedian; 633 and 634, median; 635, inferior. 
Fig. 636. Subhemispherical basal cell of Oedogonium. 
Fig. 637. Elongated type of basal cell of Oedogonium. 
Fig. 638. Formation of oogonium O and suffultory cell S from a division of a 
vegetative cell, in Oedogonium. 
Figs. 639 and 640. Suffultory cells of Oedogonium. 
Figs. 641-645. Formation of oogonium in Bulbochaete. OO, young oogonium; 
PO, patent oogonium; EO, erect oogonium; US, upper suffultory cell; 
LS, lower suffultory cell; D, dwarf male with antheridium; A, andro- 
sporangium. 
Figs. 646 and 647. Development of 4 zoospores from germinating oospore. 
(After Juranyi.) 
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