478 SMITH: ALGAE FROM THE LAKES OF WISCONSIN 
Richteriella globosa Lemm. Forschungsb. Biol. Stat. Plén 5: 
107. 18097. 
Richteriella botryoides Lemm. Hedwigia 37: 307. pl. r0, f. I-6. 
1898; Arch. Hydrobiol. u. Planktonkde. 5: 306. 1910. 
Richteriella botryoides forma fenestrata Chodat, Matér. pour la 
Flore Crypt. Suisse 1°: 194. f. 170. 1902. 
Richteriella botryoides forma tetraedrica Lemm. Arch. Hydrobiol. 
u. Planktonkde. 5: 307. 1910; Ber. Deutsch. Bot. Ges. 18: 
90. pl. 3, f. 9-10. 1900. 
PLATE 25, FIG. 18 
This alga is most widely known as Richteriella botryoides, a name 
which is untenable under any ci t In 1904 Lemmermann 
pointed out that the overlooked genus Micractinium Fresenius 
bears considerable resemblance to Richteriella Lemm. He thinks, 
however, since the description is so vague and most of Fresen- 
ius’s figures illustrate only single cells, that the organism Fresenius 
saw was what is commonly called Golenkinia. Wille holds that 
all of the spherical-celled forms with radiating bristles constitute a 
single genus and makes the subgenus Golenkinia for the solitary 
forms and Richteriella for the colonial ones. He very logically 
applies Fresenius’s name Micractinium to this composite genus. 
In my opinion the colonial and solitary habits are too diverse 
to warrant placing both of them in the same genus. The question 
then arising is, shall Micractinium be substituted for Golenkinia or 
for Richteriella? Lemmermann’s account (1904) creates the im- 
pression that Fiesenius’s description fits Golenkinia better than 
Richteriella. The cell measurements given by Fresenius, 1/170- 
1/150 mm. (5.88-6.67 #) as a maximal and 1/300 mm. (3.33 #) 
or less as the minimal dimensions, are much nearer Richteriella 
botryoides than Golenkinia radiata Chodat or any other Golenkinia 
species. It must be admitted that Fresenius does not emphasize 
the colonial habit, which characterizes Richteriella, but he does state 
that colonies of two to four cells are found and that there may be 
more than four cells in the colony so that a berry-shaped (mul- 
berry?) colony is formed. Since Golenkinia forms only temporary 
colonies and since these never con tain more than four cells it seems 
to me that the organism Fresenius saw is the one which Lemmer- 
mann has described as R. botryoides. 
