microporespores

Microporespores is a descriptive term used in mycology, phycology, and sporology to denote spores whose outer wall bears micropores—minute apertures typically smaller than a few micrometers in diameter. The micropores may be scattered or arranged in defined patterns and are distinguished from smoother spores or those with larger apertures (pori or sulci). In some descriptions, micropores are part of the exine or outer coat and connect the exterior to a spore cavity, potentially influencing exchange with the environment.

Detection and morphology: Micropores are best resolved by scanning or transmission electron microscopy; light microscopy can reveal a textured or punctate surface but usually cannot resolve the smallest pores. The wall structure is often multilayered, with a resilient outer coat and an inner wall; micropores may serve as controlled passageways during hydration and germination.

Occurrence: Reports of micropore-bearing spores come from a variety of small taxa, including certain microfungi, as well as spores of some algae and bryophytes. In many lineages, micropores are rare and considered a secondary feature rather than a defining character.

Function and taxonomic use: The functional role of micropores is not universally established. Hypotheses include regulated water uptake, gas exchange, or localized enzyme release during germination. Because terminology and criteria vary among workers, microporespores are generally treated as a descriptive trait rather than a definitive taxonomic marker, and the term may be used variably across sources.