Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?
A. Psilopsida
B. Lycopsida
C. Sphenopsida
D. Prteropsida
Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?