The Simplest Forms of Life. 149 



Cells very short, broader than long, (U L o T R i c H E ^, K t z g.) 

 Filaments adhering loosely together [un- 



branched], Ulotrix, Ktzg. 



Swarm-spores with crown of cilia, solitary in the 

 articulated cells, others of which expand to 



spherical oogonia, (CE D OGO N I AC E^E.) 



Filaments not branched, CEdogoiu'ion, Link. 



Filaments branched with long bristles, Biilbochcete, Ag. 



Appendix : Chantransiacecs, Rbh. Color bluish- 

 green, violet, or purple-red, spores only in the 

 terminal cells, CJiantransia, Fr. 



I. FAMILY. ULVACE^. 

 Membranous, coherent layer of cells. Propagation by swarm-spores. 



1. Gen. Etiteromorpha, Link. Tubular or saccate membranes, 



which grow attached to the bottom or floating free. 

 Cells angular, rounded. 

 E. iiitestinalis, Link. Tubular fronds, grass-green, 15-30 cm. 

 long, cells 0.01-0.018 d. [size very variable ; found also in 

 salt or brackish water.] 



2. Gen. Frasiola, Ag. Leafy layers upon mioist ground, out 



of water. 

 P. crispa, Ktz. Crispy, wrinkled coatings. 



3. Gen. Protoderma, Ktz. Forms crust- like coatings. 



[4. Genus. Merismopedia, Meyen. Cells globose, oblong, joined in 

 families of 4, 8, 16, etc. Free swimming, or resting on the bottom 

 of stagnant pools. On account of the deep green color of the 

 chlorophyll classed by some among the Phycochromacese. Prop- 

 agated by cell division. 



M. nova. Wood. Cells oval, close, in families of 16 ; sometimes con- 

 stricted in the middle, margin of thallus straight, entire. 



M. convoluta, Breb. Thallus more or less folded ; families composed 

 of 256 cells arranged in sub-families. Cells spherical or oblong, 

 homogeneous, green. 



5. Genus. Schizomeris, Ktz. } Thallus fiUiform, cylindrical, here and 

 there strongly contracted, adnate by the strongly contracted base. 

 Growth by cell-division in two or three directions. Propagation 

 by swarm-spores.] 

 P. viride, Ktz. Upon stones under water. 



II. FAMILY. CH^TOPHORE^. 

 Filaments dichotomously [or otherwise] branched, or laterally tufted« 

 The ends of the branches often with hair-like points. [Fronds invested 

 with gelatin.] 

 I. Gen. Coleochcete, Breb. The short dichotomously branched 



