equisetaceae for education in laboratory.

arvense background beetles botanical carboniferous closeup cone decorative detail education elateridae elaters equisetaceae equisetopsida equisetum family field fossil genus grass green growth herb homosporous horse horsetail hygroscopic laboratory like living macro microphylls microscope microscopic microscopy only perennial plant plants prothalli puzzlegrass rosemary rush saporophyte science scientific scouring snake sporangiophores spore spores spring stem stereo strobili strobilus tail vascular