148 American Quarterly Microscopical Joiir7ial. 



V. geminata, Lgb. Fertile branches three-pronged. The cen- 

 tral prong forms an antheridium, the lateral ones bear 

 elongated, often slightly bent spores, blunted above. 



V. hamata, Lgb. Branches with one oogonium and one 

 hooked, bent, antheridium. 



V. terrestris, Lgb. With horn-shaped, bent, antheridia, on the 

 back of which lie the single oogonia, with flat bases. Is 

 found on moist ground. 

 In moist places out of water also take root the small species of the 



genus 



Botrydium, Wallroth \Hydrogastrwn, Desv.], especially on shores 

 subject to inundation. 



B. gra?iulaimn, Grev. Pear shaped little cells, the size of mus- 

 tard seed, leek-green. 



[With a branched, root-like portion growing in the ground. By bud- 

 ding the plants form tufts like bunches of grapes. Hydrodictyon is 

 now placed in this family by some writers.] 



ORDER II. CONFERVACE^. FILAMENTOUS ALG^. 

 Many celled Algae of very different forms. Propagated by swarm- 

 spores and oospores. Many of them are aerial Algae : in water the fol' 

 lowing families and genera are found : 

 Membranous, coherent layers of cells formed by di- 

 vision of the cells in two directions (U L v A C E yE, A g h.) 

 closed in form of a tube, Enteromorpha, Link. 

 (Leaf-like, lying upon solid bodies : Prasiola, 

 Ag., incrusting : Protoderma, Ktz.) 

 Cell family with terminal growth. 

 Swarm-spores with 2-4 cilia, several in one cell, 



Terminal cell often with hair-like point, (CHiETOPHORE/E, Rbh.) 

 disk like, Coleochcete, Breb. 



filamentous, 



filaments branched with tufted branches 



in soft gelatinous matrix, ChcetopJiora, Schrk. 



in slippery flowing flocks, 



branches like the stem, Stigcochnimn, Ktzg. 



branches finer than the stem, Draparnaldia, Agh. 



Terminal cell without hair-like end, 



Cells longer or as long as thick, (C o N F E R v E ^, K t z g.) 



Filaments without branches, cylindrical, 



forming swarm-spores, Microspora, Thuret. 



sterile [no spores observed], Con/cr^'a, L. 



Filaments branched 



branches like the stem, Cladophora, Ktzg. 



branches fine, like hair roots, Rhizoclonitim, Ktzg. 



