14 Vnivirslty of California Publications in Botany [Vol.8 



Polycystis might properly be chosen for the generic name were 

 it not for the earlier An<icystis of Meneghini. Anacystis was first 

 published in 1837 (p. 6) to include A. marginaia and A. hotryoidcs. 

 It was again publislied by :Meneghini in 1838 (p. 25) but without 

 mentioning .1. nmryinnta or any of the species related to it. Finally 

 in 1842 (p. 92) jMeneghini emended the genus on the type of A. 

 marginuta. 



Anacystis was recognized by Reichenbach in 1841 (p. 18) and 

 by de Brebisson (1841, p. 417) in the same year. It was also included 

 by Endlicher among the genera of algae in 1843. In 1846 (p. 7), 

 Kuetzing designated it as the first of his segregates from Microcystis 

 to include his M. marginata and 31. parasitica and in 1849 (cf. 1849a, 

 p. 209) he used it with nearly the same coiitent, adding only a doubt- 

 ful species. 



Our conclusions are that Microcystis as finally revised by Kuetzing 

 is practically sj^nonj-mous with Englcna and that Anacystis and Poly- 

 cystis are to be applied to the same group of species. Of these 

 Anacystis clearly has the priority- of publication. 



Anacystis elabens (Breb.) S. and G. 

 Plate 4, fig. 6 



Cells oblong-ellipsoidal, 3.5-4ju, by 5-6fi, closely packed together in 

 more or less globose or globose-elliptical colonies 60-80/* broad, aggre- 

 gated into botryoidal masses of fair size (up to 500fi), pale bluish or 

 verdigris green. 



Among filamentous algae. Pacific Beach, near San Diego, Cali- 

 fornia. Mrs. M. S. Snj'der. 



Setchell and Gardner, in Gardner, New Pac. Coast Mar. Alg. Ill, 

 1918a, p. 455, pi. 38, figs. 6, 7; Collins, Holden and Setchell, Phyc. 

 Bor.-Amer. (Exsicc), no. 2251. Micraloa elahens de Brebisson, in 

 Meneghini, Monogr. Nostoeh. Ttal., 1842, p. 104. Microcystis elahens 

 Kuetzing, Tab. Phyc, vol. 1, 1846, p. 6, pi. 8. Polycystis elahens 

 Kuetzing, Sp. Alg., 1849a, p. 210; Farlow, N. E. Algae, 1881, p. 28. 



This is a true Anacystis of the Polycystis or botryoidal type. It 

 has been compiared w^ith the type specimen of Kuetzing 's Polycystis 

 elabens and found to agree very closely although the cells average 

 very slightly larger (0.5-1.0/x in each diameter). They are decidedly 

 smaller than those of the type specimen of Polycystis pallida (Kuetz.) 

 Farlow. Tliere are differences in cell dimensions as well as those of 

 the colony to separate A. elabens from both Microcystis litorea Hansg. 

 and Anacystis Reinboldii Richter. 



