Axil
Angle between the stem and the leaf
Microphyll (leaf)
An organ that is small, simple, and has one vein
Adventitious roots
Structures that come right out of the stem and grow wherever they want
Sporophyll
A leaf that bears sporangium
Strobilus
Structure that has the stem, leaves and sporangia tightly packed
Sieve cell
A long, slender sieve element found in the phloem
Protoxylem
The first part of primary xylem
Metaxylem
The part of the primary xylem that differentiates after the protoxylem and before the secondary xylem
Microsporangium
Structure or organ that produces microspores
Microspore
A spore that gives rise to a male gametophyte
Megasporangium
Structure or organ that produces megaspores
Megaspore
A spore that gives rise to the female gametophyte
Leaf cushion
Pyramid-shaped structure at the base of each leaf
Leaf scar
A scar, located in a leaf cushion, with one vascular bundle scar and two parichnos scars
Protostele
A type of stele with one column or rod of xylem with a layer of phloem
Exosporic gametophyte
Gametophyte is located outside of the spore
Bisexual gametophyte
Gametophyte that has both antheridia and archegonia
Endosporic gametophyte
Gametophyte is in the cell wall of the spore
Unisexual gametophyte
Gametophyte has one type of sex organ
Leaf trace
The part of the vascular bundle extending from the base of the leaf to its connection with a vascular bundle in a stem