Fruit bodies of Clavulina hispidulosa will be easily confused with those of C. leveillei and C. copioso-cystidiata, for they are branched and mouse-grey by maturity. The species differs from both in producing septate cystidia which are clamped throughout. Basidial morphology is similar to that of C. copioso-cystidiata, but the spores are larger. Clavulina hispidulosa was the first of several taxa to be described with septate cystidia. An Indian specimen (TENN no. 37644, ex PAN) under this name agrees well with the collections cited below. Other taxa with such cystidia now include C. humilis, C. samuelsii (Figs 55, 56), C. septo-cystidiata, and C. geoglossoides (not invariably). Corner et al. (1956) indicated that additional forms were to be found in Australasia, and this has proven to be so. Aside from possessing similar cystidia, however, these taxa seemingly have little else in common, spanning fruit body morphology and colour. In all these taxa, the refringent apical cell of the cystidium is often disarticulated in microscope squash mounts, and remains discrete, without evacuating its contents, as though the contents were rigid. Occasionally, these apical cells may be seen floating separately in mounts, and are identifiable because they are deep orange-ochre and refringent under phase contrast.[1]
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