Smith—Algae Found in Wisconsin Lakes 
647 
Genus XANTHIDIUM Ehrenberg 1834. 
Xanthidium subhastiferum W. West. 
Jour. Linn. Soc. Bot. 29: 166. pi. 22, f. 4. 1892. 
I. Birch (ss), Catherine (rr), Catfish (sss), Cranberry (sss), Kawa- 
guesaga (rr), No Mans (ss), Eock (r), Sishebogema (rr), Squir¬ 
rel (rr), Tamarack (rr), North Turtle (rr). 
III. Bear (rr), Beaverdam (s). Horseshoe (s), Shell (ec). 
Xanthidium antilopaeum var. depauperatum W. & G. S. West. 
Trans. & Proc. Bot. Soc. Edinburgh 23: 23. pi. 1, -figs. 15-16. 1905. 
I. Otter (rr). 
Xanthidium antilopaeum var. polymazum Nordstedt. 
Acta Univ. Lunds 9: 38. pi. 1, /. 20. 1873. 
I. Cranberry (rrr), Found (rr), George (rr). 
III. Beaverdam (ss). Horseshoe (rr). 
Xanthidium cristatum var. leiodermum (Roy & Biss.) Turner. 
Kgl. Sv. Vet.-Ak. Handl. 25: No. 5: 99. pi. 12, /. 33. 1892. 
III. Chetek (rrr). Island (rrr). 
Genus ARTHRODESMUS Ehrenberg 1838. 
Arthrodesmus incus var. ralfsii forma latiuscula W. & G. S. 
West. 
Monogr. of Brit. Desm. 4: 96. pi. 114, f. 5. 1912. 
II. George (rr), Pardee (rr). 
III. Dummy (rrr). Horseshoe (rr). 
Arthrodesmus triangularis Lagerheim. 
Ofvers. Kgl. Vet.-Ak. Forh. 42: No. 7: 244. pi. 27, /. 22. 1885. 
III. Dummy (rr). 
var, inflatus W. & G. S. West. 
Jour. Linn. Soc. Bot. 33: 320. 1898; Monogr. of Brit. Desm. 4: 99. pi. 114, 
j^gs. 14-15. 1912. 
III. Horseshoe (rr). 
var. INFLATUS forma robusta W. & G. S. West. 
Monogr. of Brit. Desm. 4: 99. pi. 114, /. 16. 1912. 
III. Shell (rr). 
