frustule

In botany|lang=en terms the difference between theca and frustule

is that theca is (botany) the pollen producing organ usually found in pairs and forming an anther while frustule is (botany) the siliceous shell of a diatom.

As nouns the difference between theca and frustule

is that theca is (biology) any external case or sheath while frustule is (botany) the siliceous shell of a diatom.

As nouns the difference between frustule and raphe

is that frustule is the siliceous shell of a diatom while raphe is a ridge or seam on an organ, bodily tissue, or other structure, especially at the join between two halves or sections.

As nouns the difference between terms and frustule

is that terms is while frustule is (botany) the siliceous shell of a diatom.

As nouns the difference between frustum and frustule

is that frustum is a cone or pyramid whose tip has been truncated by a plane parallel to its base while frustule is the siliceous shell of a diatom.

As nouns the difference between diatom and frustule

is that diatom is a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class class: Diatomophyceae or division Bacillariophyta, formerly all included in the order order: Diatomaceae, now obsolete while frustule is the siliceous shell of a diatom.

As an adjective siliceous

is (chemistry) of, relating to, consisting of, or resembling silica or silicates.

As a noun frustule is

(botany) the siliceous shell of a diatom.

As nouns the difference between frustule and epitheca

is that frustule is (botany) the siliceous shell of a diatom while epitheca is (microbiology|planktology) the upper half of the theca of a thecate protist such as a diatom or dinoflagellate.