446 THURSTON: SEX IN THE CONJUGATAE 
Mesocarpus macrosporus (Wolle) Debarya desmidioides (West) 
radicans olle) L ptosperma (Wittrock) 
A recurvus olle) ies ardyi (West) 
- peesion (Wolle) = laevis (West) 
aris (Wolle) immersa (West) 
Debaroa arican (West) ay reticulata (West) 
mericana (Transeau) . Pyxispora mirabilis (West) 
% pais bore est Temnogametum heterosporum (West) 
decussata (Transeau) 
TABLE III 
CONJUGATION LATERAL, SPORE IN ONE OF THE CELLS 
Zygnema ee _- sall) Spirogyra pabtie 57 (Petit) 
lei m (Cooke) salliit (Wol 
stell um. m (Wolle ) At acannon (Transeau) 
Mongoose nummuloides (West) es inflata (Cunningham) 
a (West) sa intermedia (Hassall) 
Spirogyra afins (Fritsch) 1 insignis (Cooke) 
gulare (Hassall) tt Juergensii (West) 
a bellis e) = longata (Tréndle) 
ty tanaeformis (Petit) i mirabilis ) 
ie commu Petit) ae neglecta (T. le) 
ie condensata (Cooke) e at. aot ag 
Mes crassa (Cook n quadrata (Co 
ug — (West) s rectangu lave Gransean 
c a (West) . Spreeiana (Pet 
os Page (Cooke) tenuissima esas 
acilis est) m varians (Petit 
sf groenlandica (West) - Weberi (Cooke) 
TABLE IV 
CONJUGATION LATERAL, SPORE IN THE CONJUGATION TUBE 
Mesocarpus pleuro oe (Cooke) Mougeotia mirabilis (Wolle) 
Mougeotia genuflexa (West) Temnogametum heterosporum (West) 
LITERATURE CITED 
1. Bennett, A. W. Sexuality among Conjugatae. Jour. Bot. 29: 
172... 1891. 
2. Bessey,C.E. Sexuality in Zygnemaceae. Am. Nat. 18: 421, 422. 
1884. 
3. Cunningham, B. Sexuality of filament of Spirogyra. Bot. Gaz. 
63: 486-500. pi. 23-25. AOI7. 
4. Petit, P. ‘Spirogyra des environs de Paris. Pals 1880. 
65. Trndle, A. Uberdie Reductionsteilung in den Zygoten von Spiro- 
gyra und tiber die Bedeutung der Synapsis. Zeitschr. Bot. 3: 593- 
619. pl. 5 +f. 1-20. IQII. 
6. West, W. & G. S. Observations on the Conjugatae. Ann. Bot. 
12: 29-58. pl. 4,5. 1898. 
7- West, G. S. Algae 1. Cambridge. 1916. 
8. Wittrock, V. B. On the spore-formation of the Wecuaeee and 
especially of the new genus Gonatonema. Bih. Kongl. Svensk. 
Akad. Handl. 5°: 1-180. 1 pl. 1878. : 

