Inflorescence along rigid shoot bearing monosporan- 
giate strobili in the axils of rigid bracts. Strobili borne 
spirally. Strobili composed of a short stout axis bearing 
numerous spirally disposed bracts some of which are 
fertile. 
Female strobilus having from one to four erect ter- 
minal ovules borne singly upon woody bracts which are 
tetragonal in transverse section. All of the ovules still at- 
tached in the strobili are immature, somewhat ‘‘flat- 
tened,’’ and bilaterally symmetrical. There appears to be 
only one integument. 
Male strobilus bearing from one to numerous (six or 
more) woody microsporophylls which are tetragonal in 
transverse section like the sterile bracts. Each microspo- 
rophyll bears six terminal erect microsporangia or pollen- 
sacs which are 2.2 to 2.4mm. in length, outlined by dense 
**palisade’’ cells and containing a tissue of isodiametric 
thin-walled parenchyma. Pollen-grains large, ellipsoid, 
winged. Male gametophyte composed of many (more 
than twenty) cells. 
Iowa: Dallas County, Waukee, Shuler Mine. 42580 (Holotype); 
42468, 42471, 42472, 42473, 42474, 42581, 42582, 42585, 42586, 
42603 Supplementary types (Plesiotypes). F.O.Thompson Coll. : Polk 
County, Walnut Township, Urbandale Mine. F.O.Thompson Coll. : 
Lucas County, Williamson Mines 8, 4 and 5. F.O.Thompson Coll. : 
Wapello County, s.w. of Ottumwa, Tillotson Mine. F.O.Thompson 
Coll. 
Kansas: Crawford County, Frontenac. F.O.Thompson Coll. 
CarRBONIFEROUS: Pennsylvanian: Des Moines Series. 
The type and plesiotypes are from coal known locally 
as number 7. 
Discussion. 
The diagnosis given above is based upon one hundred 
well preserved specimens of individual strobili and five 
specimens showing more than five strobili on asingle axis. 
[3 ] 
