angiopteris: highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall
tree fern: any of numerous usually tropical ferns having a thick woody stem or caudex and a crown of large fronds; found especially in Australia and New Zealand; chiefly of the families Cyatheaceae and Marattiaceae but some from Polypodiaceae
antitoxin: an antibody that can neutralize a specific toxin