APPENDIX. 381 



4. Myriotrichia. Frond unbranched, ramuli whorl ed, 

 tipped with pellucid fibres. 



Order III. CHLOROSPORE^E or CO^FERVOIDE^E. 

 In sea or fresh water, or on damp surfaces, with fila- 

 mentous, or more rarely a leaflike thallus; microscopic 

 forms, sometimes pulverulent or gelatinous, consisting fre- 

 quently of definitely arranged groups of distinct cells, 

 with an ordinary structure, or with their membrane silici- 

 fied (Diatomacese). Fructification varied. 



1. Resting spores produced from cell-contents after fer- 

 tilization either by conjugation or impregnation. 



2. Spermatozoids produced from the contents of other 

 cells. 



3. Zoospores. Two, four or multiciliated active gonidia, 

 discharged from the vegetative cells without impregna- 

 tion and germinating directly. 



The simple vegetative increase of unicellular forms is 

 analogous to cell division of filamentous forms. 



The Volvocinese pass the vegetative stage of existence 

 as ciliated zoospores collected within a gelatinous com- 

 mon envelope. 



Family I. LEMANE^;. Frond cartilaginous, leathery, 

 inarticulate, filamentous, hollow, with whorls of wans 

 at irregular distances, or necklace-shaped. Fructification 

 tufted, simple, or branched ; necklace-shaped filaments, at- 

 tached to inner surface of tubular frond, and breaking up 

 into elliptic spores. G row in fresh water. 



1. Lemania. Two species, L. torulosa and L.flumatttis, 

 in clear running streams. 



2. BATBACHOSPERM&B. Plants filamentous, articulated, 

 invested with gelatin. Frond of aggregated, articulate, 

 longitudinal cells, whorled at intervals, with short, hori- 

 zontal, cylindric, or beaded, jointed ramuli. Fructification 



