• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Acaulospora excavata Ingleby & C. Walker

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Scientific name
Acaulospora excavata
Ingleby & C. Walker
Common names
IUCN Specialist Group
Assessment status
Proposed by
Joana Veras
Comments etc.
Joana Veras

Assessment Notes

Taxonomic notes

Spores form laterally on the necks of sporiferous saccules, which are
110–190 × 100–165 µm. Spores are globose to subglobose to oval (115–195 ×
100–180 µm), pale ochraceous to pale yellow to yellow orange to sometimes
bright yellow. The spores form three walls: triple-layered outer wall (OWL1-3),
bi-layered middle wall (MWL1-2), and triple-layered inner wall (IWL1-3).
OWL2 with circular to elliptical pits (3.9–20 × 3.5–16 µm in diam.; 2.2–6.3
µm in depth). IWL1 with ‘beaded’, granular structure; IWL2 staining purple to
dark purple in Melzer’s reagent.

Why suggested for a Global Red List Assessment?

Due to the several records worldwide, we suggest this species to be categorized as Least Concern (LC).

Geographic range

Common species, distributed in several countries with 15
occurrence recorded in GBIF.

Population and Trends

A. excavata originally isolated from Mopri Forest Reserve in Ivory
coast (West Africa). In Brazil, this species was registered in the states of Manau, Pernambuco, São Paulo, Ceará, Minas Gerais e Paraíba, Bahia.

Population Trend: Improving

Habitat and Ecology

In Brazil, this species is registered in different biomes, such as Amazon rainforest, Cerrado, Atlantic rainforest and Caatinga.


As mandatory symbionts, arbuscular mycorrhizal fungi pass a part of the life cycle associated with a host (plant). Thus, the main threats related to these fungi are the loss of vegetation and soil disturbances.

Housing & urban areasScale Unknown/UnrecordedUnintentional effects (species being assessed is not the target)

Conservation Actions

Soil microorganisms, especially arbuscular mycorrhizal fungi, receive little attention in the field of conservation biology, although they play a crucial role in the production of fundamental ecosystem services, such as fertility, soil formation and maintenance, nutrient cycling and plant community dynamics , among others. For the conservation of these fungi, in addition to the soil, it is also necessary to preserve the associated

Research needed

In a future scenario, it is important to develop an information system that can predict the degree to which plants depend on mycorrhizal fungi and the effects of this association for both symbionts. In this perspective, understanding more about the evolutionary history and ecological aspects of these fungi, can help to understand the variation in functional attributes between species and even predict the result of interactions between the fungus and the host

Use and Trade


MAIA, Leonor Costa et al. Species diversity of Glomeromycota in Brazilian biomes. Sydowia, v. 72, p. 181-205, 2020

Country occurrence

Regional Population and Trends

Country Trend Redlisted