302 Minnesota Algae 



Ventricose, a swelling out on one Vesicular, bladdery 



side or in the middle Villous, long hairy 

 Verrucose, warted 



Vesicle, a small bladder-like cavity Zonate, disposed in the form of zones 



Note: The proper terms to be used in connection with the blue- 

 green algae have not yet become definitely established. The terms and 

 definitions given in this treatise are merely provisional, in case better ones 

 can be found. Some difficulty has been experienced with the terms: "'plant 

 mass," "colony," "family," "thallus," etc. The definition of each, as the author 

 conceives the meaning, is given in the glossary. 

 Plant mass, the usually shapeless mass of individual plants remaining in close 



proximity to each other after their formation, either because nothing 



occurs to separate them or because they are definitely held together by 



a gelatinous excretion 

 Colony, a mass of plants of more or less definite shape, large enough to be 



detected by the naked eye 

 Family, a mass of plants of microscopic size and somewhat definite shape, 



quite evidently arising from the division of a single cell 

 Plant, in the coccogoneae a single cell; in the hormogoneae a single trichome. 



In the latter case it may be thought better by some to consider "plant" 



and "filament" as synonymous terms. 



