DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Clubmoss (Lycopodium clavatum) stem. Light micrograph of a section through a stem from a stag's-horn clubmoss plant, showing the central stele and outer layer of epidermis (red) with its cuticle. The stele consists of parallel plates of xylem tracheid cells, large thick metaxylem cells (red), small thick cells of protoxylem (red) and alternating bands of phloem sieve tube cells (green). Magnification: x37 when printed 10 centimetres wide.
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