Igtt] COULTER & LAND—LEPIDOSTROBUS 453 
a phycomycete; but whatever it is, it became associated with 
rootlets that penetrated among the sporophylls of fallen strobili of 
Lepidodendron. 
THE UNIversity oF CHICAGO 
EXPLANATION OF PLATES XXVIII AND XXIX 
PLATE XXVIII 
Fic. 1.—Transverse section of strobilus; Xt. 
Fic. 2—Median longitudinal section of stobilins: x1. 
Fic. 3.—Tangential section of strobilus; tr. 
Fic. 4.—Transverse section of aparopEys 1o mm. - from axis; X12 
Fic. 5.—Abaxial view of sf yll, from in plaster: oe 5 
Fic. 6.—Abaxial view, showing dehiecence of sporangium; X2.5. 
Fic. 7.—Lateral view of sporophyll, showing relation of sporangium and 
ligule; X2.5. 
Fic. 8.—Abaxial view of lamina = sporophyll; 2.5. 
PLATE XXIX 
Fic. 9.—Transverse section of sporophyll 1 mm. from axis; X12. 5. 
Fic. 1o.—Transverse section of sporophyll 6 mm. from axis; X12. 5. 
Fic. 11.—Transverse section of sporophyll, showing triradiate dehiscence; 
29:6. 
Fic. 12.—Transverse section of sporophyll near distal end; X12. 5. 
Fic. 13.—Transverse section through sporophyll, ligule, and free distal 
end of sporangium; X12.5. 
Fic. 14.—Median longitudinal section through a sporophyll from basal 
ines of strobilus, showing ligule and path of vascular strand; X2.25. 
G. 15.—Median longitudinal section of sporangium parallel with the 
axis 0 the sporophyll; 2.25. 
Fic. 16.—Median longitudinal section through ligule, showing general 
relations of parts; 2 
Fic. 17.—Section through sporangium wall, showing the palisade-like 
cells; X 229. 
Fic. 18.—Section of cpio wall parallel with its surface; X 229. 
Fic. 19.—Microspore (? 
Fic, - —Detail pepe ig x of pleas bundle of stalk of sporophyll, show- 
ing central protoxylem; 475. 
