Prothallus | ‖n.; pl. Prothalli [ NL., fr. Gr. &unr_; before + &unr_; a young shoot. ] (Bot.) The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the oophoric generation of ferns, etc. [ 1913 Webster ] |
Thallus | ‖n.; pl. Thalli [ NL., fr. Gr. &unr_; young shoot or branch, frond. ] (Bot.) A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens. [ 1913 Webster ] |