Yoshimuria is characterised by a crust-like (crustose)
thallus, which can vary greatly in thickness from very thin to thick and can be (i.e., divided by cracks into sections called ). The colour of the thallus ranges from whitish grey to dark grey or brownish grey. The
apothecia of
Yoshimuria (fruiting bodies) are either (with a ) or (without a thalline margin), and are typically (attached directly without a stalk). The disc of these apothecia can be yellow, orange, or dark rust-brown in colour. The the tissue surrounding the
hymenium of the apothecia, is , meaning it consists of hard, thick-walled cells. The , the layer beneath the hymenium, does not contain oil droplets. The of
Yoshimuria are , meaning they have two distinct compartments, with eight spores in each
ascus. The
conidia, or asexual spores, are broadly (rod-shaped). Chemical
spot tests reveal that the thallus reacts slightly or not at all (K±) and the apothecia turn purple (K+ purple) when treated with a
potassium hydroxide solution. The chemical constituents include
anthraquinones, which follow the
parietin , and
atranorin in some species. ==Species==