Seedless Vascular Plants

the two main lineages of seedless vascular plants are:

microphyll and megaphyll

leaves that are not associated with leaf gaps

microphylls

division ______ contains the only extant plant species with microphylls

Lycophyta

the sporangia of lycophytes are produced on the surface of modified leaves called _______

sporophylls

in many lycophytes, sporophylls are produced in cone-like clusters called _______

strobili

species that only produce one type of spore are called:

homosporous 

species that produce both microspores and megaspores are called:

heterosporous

leaves that are associated with the formation of leaf gaps

megaphylls

the spores of Lycopodium and Selaginella are found within a structure called the: 

strobilus 

Lycopodium is homosporous or heterosporous?

homosporous

Selaginella is homosporous or heterosporous?

heterosporous

fern plants have megaphylls or microphylls?

megaphylls

the megaphylls of ferns are commonly referred to as:

fronds

Fern produce sporangia in clusters called:

sori

the protective covering for the sporangia of ferns is called:

indusium 

one one side of the sporangium, a ring of enlarged called the ________ forms. Its function is to open the sporangium and release the spores

annulus

on the opposite side of the sporangium, _______ form that break open, leaving an aperature

lip cells

a fern gametophyte is often called a":

prothallus

the sporangia of Psilotum are found in a three-part cluster called a: 

synangium

each synangium consist of three sporangia fused to one another and sharing a common outer wall. The outer wall contains several small ________ cells that open the wall then they lose sufficient water

dehiscent