GLOSSARY. 113 



Saccate: sac-like, baggy. 



Scabrous: rough. 



Septate: with a partition. 



Serrate: with saw-teeth, or teeth pointing forward. 



Setiforni: bristle-like. 



Setigerous: bearing bristles or setje. 



Sigmoid: s-shaped. 



Sinus: the depression between two parts of a cell. 



Spermatozoa: active, thread-like bodies in certain cells. 



Spermogonia: cells which give rise to the spermatozoa. 



Spimclose: bearing short spines or prickles. 



Stipe: the stem or stalk. 



Stipitate: with a short stem or stalk. 



Stratum: a layer, anything spread out in a layer. 



Sub.: in compound words, meaning less than. 



Subulate: awl-shaped. 



Thallus: a mass of cells, consisting of one or more layers, often a 



flat expansion. 

 Tortuous: irregularly curved, winding, twisted. 

 Truncate: as if cut off square at the end. 

 Tnberculose: with small rounded projections or tubercles. 



Umbellate: the branches or parts beginning at the same point, like 

 the ribs of an umbrella, 



Ventrum: in this case, the concave region of Closterium. 

 Verruca, plural VerruccB: rounded, wart-like elevations. 



Whorl: m a circle round the stem. 



Zoospores: spores with active movements. 



