These are comparatively few and large, and are in fours; so they are very like the macrospores of Pillworts or Quillworts.
Section of a spore-case containing macrospores, equally magnified; at the right three macrospores more magnified.
Scale and sporangium from lower part of cone, containing macrospores 51 (6).
Macrospores two-thirds to one millimetre in diameter.
We may under these names speak of their detached discs as macrospores and of their cellular envelopes as sporocarps.
The macrospores above referred to may have belonged to humble aquatic plants mantling the surfaces of water or growing up from the bottom, and presenting little aërial vegetation.
To this we may add the appearance of these macrospores in coals and shales of the Carboniferous period, though there in association with other forms.
Diameter about one one-hundredth of an inch, or a little more, When in situ several macrospores are contained in a thin cellular sporocarp, probably globular in form.
The macrospores collected by Mr. Thomas from the Chicago clays and shales conform closely to those of Kettle Point, and probably belong to the same species.
The macrospores are in the shape of a low triangular pyramid with a hemispherical base, and marked with elevated ribs along the angles.
The two kinds of spores in separate thin-walled 1-celled sporocarps or conceptacles clustered beneath the small floating fronds; macrospores solitary.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "macrospores" in a variety of sentences. We hope that you will now be able to make sentences using this word.
