Definition of protonema in English:

protonema

noun 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:

protonema

nounˌprəʊtə(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.

词汇	protonema
释义	Definition of protonema in English: protonema noun 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: protonema nounˌprəʊtə(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.
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