ÜF.SMIDS FLORA OF MICHIGAN 
259 
C. faxiclïondrum var. obsoletumifonne var. nov. (PI. 1, Fig. 3). 
Haec varieias a specie typica atyiie ab eius oarietatibiis differt 
possessione avyulorum valde iiicrassaiorum, submammillatorum 
conuergentium, poriini miicosiim ut uidetur inchidentiuni (poros 
mucosos forsilan includentiam). Celhila 34 u. long., 3i a lat. 
Isthmiis 7 y. lat. 
This variety difl'ers from the typical and froin lhe varieties of 
the typical by the possession of greatly thickened angles which 
are submainmillate and convergent and which apparently in- 
clude a mucilage pore. Cell length 34 y., cell width 34 a, isthmus 
7 11 . Sniall unnamed lake near Clover leaf Lake, south and west 
of Watersmeet in Cisco lakes région. Also Lake 22, Presque Isle 
County. 
The semi-cell wall granulation is similar only to var. unigra- 
nulaiuin in lhe possession of a single supraisthmial granule. 
The semicell shape, however, séparâtes these two varieties. This 
variety should be coinpared wilh C. sinolandicnni Lund. which 
lacks the supraisthmial granule and possesses a single papillae 
at each basal angle, and with C. sniolandicuni var. angustatum 
(Hantzsch) Reinsch which lias a different semi-cell shape and 
which lacks the supraisthmial granules. C. obsoletuin has thicke¬ 
ned and subinammillate basal angles but lacks the supraisthmial 
granules. The Presque Isle specimens are very similar to the 
unnamed forma illustrated (PI. 4, Fig. 19) by Prescott (1938) 
from Isle Royale, thus necessitating a variety naine. 
C. iaxichondrum var. Irenee-Marie nob. (Irénée-Marie. 1938, Flore 
Desmidale de la Rég. Mont. 186, PI. 27, Fig. 6-8). 
Specimens from Crawford County are similar to one of the 
individuals illustrated (PI. 27, Fig. 6) by Irénée-Marie as a new 
but unnamed variety. The writer believes that the discovery of 
this organism in Michigan corroborâtes Irénée-Marie’s original 
finding and therefore nécessitâtes the addition of a variety naine. 
C. trilobulaium var. basichondruin Nordst. Alger and Barry Coun- 
ties. 
C. trilobulatum fa. refusa Reinsch. Crawford County. 
C. variolatum var. cataractaniiu Racib. fa. Specimens from Delta 
County possess a more inflated upper semicell than usually 
présent in var. cataractaruin Racib., and thus resemble var. 
rotunduin Messikommer which possesses an apical rather than 
a central spore. The presence of the central pore, the writer 
believes, is of sufficient importance to assign these specimens 
as a form of var. cataractaruin Racib. 
C. variolatum Lund. fa. Eminet County. 
