macrosporangia

The macrosporangia (ovules) are borne on similar leaves, known as carpels, and, like the pollen sacs, borne in pairs, but on the upper side of the sporophyll instead of the lower.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The macrosporangia are also ordinarily known as "ovules," a name given before it was known that these were the same as the macrosporangia of the higher pteridophytes.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The spores are of two kinds, as in _Selaginella_, but the macrosporangia contain numerous macrospores.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

In the seed plants the macrosporangia remain attached to the parent plant, in nearly all cases, until the archegonia are fertilized and the embryo plant formed.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

There are two classes of the spermaphytes: I., the Gymnosperms, or naked-seeded ones, in which the ovules (macrosporangia) are borne upon open carpophylls; and II.,

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

At the base on the upper side are borne the two ovules (macrosporangia) (Fig.  77, _E_, _o_), and running through the centre is a ridge that ends in a little spine or point.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

_A_, fruiting leaf of a cycad (_Cycas_), with macrosporangia (ovules) (_ov.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell