Kalmar "gymnospermous bishiyar" tana nufin wani nau'in bishiyar da ke cikin rukunin tsire-tsire da ake kira gymnosperms. Gymnosperms tsire-tsire ne waɗanda ke samar da iri ba tare da rufe su cikin 'ya'yan itace ba. Maimakon haka, yawanci ana ɗaukar tsaba a saman ma'auni ko mazugi. Misalan bishiyoyin gymnospermous sun haɗa da Pine, spruce, fir, da bishiyar cedar. Ana samun waɗannan bishiyoyi a yankuna masu sanyi na duniya kuma sune mahimman tushen katako da sauran kayan itace.