Fungal spores (conidia) invading the interior of a hair shaft; there is no conspicuous external sheath of spores, as there is with ectothrix. [endo- + G. thrix, hair]
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endothrix adj occurring within or penetrating the hair shaft <\endothrix dermatophytes> also characterized by the presence of hyphae and arthroconidia within the hair shaft <\endothrix tinea capitis> compare ectothrix
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en·do·thrix (enґdo-thriks) [endo- + -thrix] a dermatophyte whose growth and spore production are confined chiefly within the shaft of the hair, without formation of conspicuous external spores; such fungi include Trichophyton tonsurans and T. violaceum.Medical dictionary. 2011.