DESMIDS FLORA OF MICHIGAN 
267 
S. floriferum West and West. Barry, Oakland and Presque Isle 
Coiinties. 
S. forficulatum var. corniitiforme var. nov. (PI. 2, Fig. 9). 
Haec varieias a specie Ippica disert possessione dnoriim ordi- 
num lineariuni graniilorum emarginatorum vel verrucarum in- 
iru marginem utrnmque laleralem {semicelhila a vertice visa). 
Ccllula 4-S y. long., sine spinis 44 u. lal., ciim spinis 67 |x lut. 
This variety ditîers froin the typical by the possession of two 
linear rows of emerginate granules or verrucae within each 
latéral inargin (vertical view). Cell lenglh 48 [a, cell width 
without spines 44 ja, cell width with spines 67 jx.. Wakeley Lake, 
Crawford Coiinty. 
This variety, while closely related to S. Jorficnlatuin Lund, 
and varieties of this species, posscsses a pattern of apical verru¬ 
cae which is suggestive of ..S. corniitum Archer.'In front view, 
the elliptical semicells are similar lo the former. Also confirming 
the close relalionship of this organism to S. forficulatum (as 
seen in vertical view) is the insertion, on each latéral margin, 
of a single si)ine or projection on each side of the angle. The 
intrainarginal linear rows of emarginate granules or verrucae 
within the bifurcate projections, however, are suggestive of 
cornutiim, especially those speciinens illiistrated by Grônblad 
(1920). 
S. fiircatiim fa. spinosa Grônblad. Gogebic and Houghton County. 
S. fiircaium var. pisciforme Turner. Alger County. 
»S’. fnrcülum var. laglorii var. nov. (PI. 2. Fig. 2). 
Haec varieias a planta tijpica dijfert possessione processuiim 
brevissimoriim lateraliuni in spinani crassissimam ad caciimen 
bifnrcaiani terminantium. Insignis neenon insertione duarum 
spinaruni ernssarum simplicium in margine laterali inter pro¬ 
cessus, iiiraqne spina in eodem piano verticali atqiie processus 
apicalis. Cellula sine spinis ,‘i3 u long., ciim spinis 47 a long., sine 
spinis lat., cum spinis 57 ;a lat., isfbmns 8 |a. lat. 
This variety is distinguished froin the typical by the presence 
of very short latéral processes which are terminated by a very 
stout spine which is bifurcate near tip. Another distinctive 
characteristic is the insertion of two stout simple spines on Ihc 
latéral margin betw'een the processes, each spine being in the 
saine vertical plane as the apical process. Cell length wnthout 
spines 33 u., cell length with spines 47 u.; cell width without 
sjiines 34 ta» cell width with spines 57 a, isthmus 8 y.. Small lake 
along road froin Paradise to Tahquamenon Falls, Chippewa 
County. 
SouKe. MNHN. Pans 
