What's the difference between epigeous and hypogeous?

Epigeous

Definition:

Example Sentences:

(1) The effect of methanol and acetone extracts of the epigeal parts of Peganum harmala, a common medicinal plant among Bedouins in Israel, was studied on several parameters of reproduction in female rats.
(2) The content of heavy metals in leafy epigeous mosses has been found to be closely connected with the content of these elements in upper soil layer.
(3) The content of some heavy metals in leafy epigeous mosses and upper soil layer of the large Moscow parks has been studied.
(4) Compatibility or incompatibility of a cross seemed to be related to the geographic distance separating the parental colonies, but not to their ecological origin (hypogeous or epigeous).

Definition:

(a.) Growing under ground; remaining under ground; ripening its fruit under ground.

Example Sentences:

(1) Heterozygosity estimates of Tcrb-C and Tcra-V1 sequences were determined for annually collected samples and compared with the yearly estimates of availability of hypogeous fungi, one of the major diet items of tassel-eared squirrels.
(2) Compatibility or incompatibility of a cross seemed to be related to the geographic distance separating the parental colonies, but not to their ecological origin (hypogeous or epigeous).