species is very thick and lamellate. In the subterranean portions of 

 the thallus, rhizoids are transversely folded and wrinkled. 



Botrydium granulatum ( L. ) Greville 1830, p. 196 

 PL 96, Figs. 17, 18 

 A dark green obovoid or globose vesicle, variable in size from 

 0.5-2.5 mm. in diameter. 



Grovi^ing on damp soil and mud, especially along stream banks 

 or near lake shores and swamps where water has recently receded; 

 often found on damp soil in greenhouses. Mich., Wis. 



CLASS CHRYSOPHYCEAE 



Most of the members of this class are motile, but a few apparently 

 closely related forms are filamentous or palmelloid. The most ob- 

 vious characteristic is the relatively large, yellow-brown chromato- 

 phore which, in addition to chlorophyll, contains an abundance of 

 phycochrysin. In a very few genera pyrenoids are present, but in 

 no case is starch formed as a reserve food, oil and leucosin being 

 the chief storage products. There are 5 orders in this class, which 

 are differentiated by general morphology and on the basis of motihty. 



Key to the Orders 

 1. Motile in the vegetative state by 1 or 2 flagella chrysomonadales 



1. Non-motile in the vegetative state 2 



2. Amoeboid, or if stationary showing 



rhizopodal tendencies rhizochrysidales 



2. Not amoeboid or rhizopodal — 3 



3. Plants pabnelloid chrysocapsales 



3. Plants not palmelloid 4 



4. Filamentous — - chrysotrichales 



4. Unicellular, cyst-like, forming autospores chrysosphaerales 



ORDER CHRYSOMONADALES 



Motile in the vegetative condition; flagella 1 or 2; either unicellular 

 or colonial; cell wall lacking but in many forms possessing a definite- 

 ly shaped envelope or lorica; three suborders. 



Key to the Suborders 



1. Swimming by 1 flagellum chromulineae 



1. Swimming by 2 flagella, but may be non-motile in 



the vegetative state 2 



2. Flagella of equal length; lorica absent , isocHRYsmiNEAE 



2. Flagella of unequal length; protoplast 



inclosed by a lorica .- ochromonadineae 



[369] 



