| 释义 |
Definition of protonema in English: protonemanoun ˌprəʊtə(ʊ)ˈniːmə Botany 1The juvenile form of a bryophyte (usually consisting of a branched filamentous structure, but sometimes flat or platelike), developing on the germination of a spore and producing buds from which the adult plants arise. 2An analogous thread-like structure in other lower plants; specifically the filamentous form of a developing gametophyte of a fern or charophytic alga.
Origin Mid 19th century; earliest use found in Miles Berkeley (1803–1889), Church of England clergyman and naturalist. From scientific Latin protonema, former genus name from proto- + -nema. Definition of protonema in US English: protonemanounˌprəʊtə(ʊ)ˈniːmə Botany 1The juvenile form of a bryophyte (usually consisting of a branched filamentous structure, but sometimes flat or platelike), developing on the germination of a spore and producing buds from which the adult plants arise. 2An analogous thread-like structure in other lower plants; specifically the filamentous form of a developing gametophyte of a fern or charophytic alga.
Origin Mid 19th century; earliest use found in Miles Berkeley (1803–1889), Church of England clergyman and naturalist. From scientific Latin protonema, former genus name from proto- + -nema. |