Morphotype amAc ("Acaulospora")
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distribution in root cortex
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both inner and outer
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auxiliary cells
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absent
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hyphae at entry point
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hyphae often prominently coiled, but usually not well visible (see
below), hyphae at entry point often thicker than the runner hyphae
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intraradical hyphae
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parallel, often thinnger than those near entry point; diameter
2 - 3 um, usually stain faintly
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arbuscules
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numerous for some subtypes of amAc (see below), fill completely
the cells ("brick-like" appearance)
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vesicles
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rarely seen, usually near entry point, 50 - 80 um long, often irregularly
shaped
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This type probably includes two or more different "Acaulospora"-like
types in Achillea roots:
First, the type with always (albeit) weekly visible hyphal coils at
entry points and intracellular vesicles formed nearby. This type is documented
by the following image (where the colony is well stained this time; I cannot
say whether the stainability has any taxonomic value here):
The other type is represented mainly by the prominent, brick-like arbuscules.
Sometimes smooth, not much abundant hyphae are seen but I've never seen
any connection of those structures to any kind of entry-point structures.
The arbuscules on this slide are interesting by their flat appearance.
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This page last modified by Petr Šmilauer on 14 September 2000