<prompt> Black coloured hard nodules In hair is produced by:Peidra hortaeEpidermophyton floecosumHortae wernickiiMalassezia furfur  <response>: Ans: a Peidra hortae Ref: Text book of Microbiology Ananthanarayana8lh editionAll are superficial mycosesPeidra - fungal infection of hair with appearance of firm, irregular nodules along hairshaftBlack piedra- Peidra hortaeWhite piedra - Trichosporon beigelli.Dermatophy tes - infect superficial keratinized tissueTrichophyton - infects skin,hair nailMicrosporum- hair skinEpidermophyton - nail skinMalassezia furfur - by yeast like lipophilic fungus Pityrosporum orbiculare. Causes Pityriasis versicolor involvement of stratum comeum with macular areas of discolouration or depigmentation of skinTinea nigra - localized infection of stratum comeum especially palm- blackbrown macular lesions byHortae wernickii 