Pustule

pustule (noun, pl. pustules) – a blister-like protuberance; (1) in Lasallia: a large, distinctly swollen blister on the thallus surface with a corresponding, hollow depression on the lower side; (2) a swollen and apically eroding protuberance with a definite outline; (3) a pustulate soralium, i. e., a swollen blister erupting into soredia. This is:part of upper thallus surface. Kind of:upper surface structure.

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