<Tr> <Th_colspan="2"> Species </Th> </Tr> <Tr> <Td_colspan="2"> <P> See text </P> </Td> </Tr> <P> Lycopodium (from Greek lukos, wolf and podion, diminutive of pous, foot) is a genus of clubmosses, also known as ground pines or creeping cedar, in the family Lycopodiaceae, a family of fern - allies (see Pteridophyta). They are flowerless, vascular, terrestrial or epiphytic plants, with widely branched, erect, prostrate or creeping stems, with small, simple, needle - like or scale - like leaves that cover the stem and branches thickly . The leaves contain a single, unbranched vascular strand and are microphylls by definition . The kidney - shaped or reniform spore - cases (sporangia) contain spores of one kind only (isosporous, homosporous) and are borne on the upper surface of the leaf blade of specialized leaves (sporophylls) arranged in a cone - like strobilus at the end of upright stems . The club - shaped appearance of these fertile stems gives the clubmosses their common name . </P> <P> Lycopods reproduce asexually by spores . The plants have an underground sexual phase that produces gametes, and this alternates in the lifecycle with the spore - producing plant . The prothallium developed from the spore is a subterranean mass of tissue of considerable size and bears both the male and female organs (antheridia and archegoniae). However, they are more commonly distributed vegetatively through above - or below - ground rhizomes . </P>

What are the club shaped structure in lycopodium called