The most striking characteristics of these species is the size of their spores, one of the largest in the phylum Glomeromycota reaching up to 812 µm. Features auxiliary cell with projections

Considering the common record of this species in different ecosystems and countries I suggest its classification as LC.

This species is recorded in different countries from Asia, South and
North America. Blaszkowski mentions that he found specimens of G. gigantean in
rhizospheric soils from Europe, Africa, and Asia.

It is believed that with more research, the number of occurrence records
for this species will be even greater.

In Brazil, this species has been recorded in Atlantic Forest, Caatinga, and Cerrado
ecosystems, both in disturbed and undisturbed areas.

As a mandatory symbiote, this species is found associated with Brazilian tropical forest vegetation that are exposed to different types of anthropogenic disturbances such as high deforestation rates, for example.

Controlling the progress of anthropogenic disturbance over tropical forests.

More research is needed on its distribution, taxonomy and ecology, such as: evaluating other areas, understanding if there is any relationship with the size of its spore and its habitat, etc.

WINAGRASKI, Etienne et al. DIVERSITY OF ARBUSCULAR MYCORRHIZAL FUNGI IN FOREST ECOSYSTEMS OF BRAZIL: A REVIEW. Cerne, v. 25, n. 1, p. 25-35, 2019.
JOBIM¹, KHADIJA; OLIVEIRA, BRUNA IOHANNA SANTOS; GOTO, BRUNO TOMIO. Checklist of the Glomeromycota in the Brazilian Savanna. 2016.
MAIA, Leonor Costa et al. Species diversity of Glomeromycota in Brazilian biomes. Sydowia, v. 72, p. 181-205, 2020.
Blaszkowski -
http://www.zor.zut.edu.pl/Glomeromycota/Gigaspora gigantea.htm
Blaszkowski J. 1990. Polish Endogonaceae IV. Gigaspora gigantea, Glomus
deserticola, and Glomus globiferum. Acta Mycol 26, 3-16.