The fungus that develops in rainy (moist) season on soil, wood, clothes etc., which has the same colour as that of the substance on which it grows.
paṇagasuhumaṃ ṇāmaṃ paṃcavaṇṇo paṇago vāsāsu bhūmikāṭṭhauvagaraṇādisu taddavvasamavaṇṇo paṇagasuhumaṃ.
(Da 8.15 ]iCū p. 278)