Prothallus
noun, plural prothalli
[proh-thal-ahy] /proʊˈθæl aɪ/ (Show IPA). Botany.
1.
prothallium.
noun (pl) -li (-laɪ), -lia (-lɪə)
1.
(botany) the small flat free-living gametophyte that bears the reproductive organs of ferns, horsetails, and club mosses. It is either a green disc on the soil surface or it is colourless and subterranean
prothallus
(prō-thāl’əs)
Plural prothalli (prō-thāl’ī)
The gametophyte of homosporous ferns and some other plants. Prothalli have chlorophyll for photosynthesis, but they are not differentiated into roots, stems, or leaves. They are usually small, flat, and delicate. Prothalli develop from germinated spores, and they bear both archegonia for producing eggs and antheridia for producing sperm. See more at alternation of generations.
Read Also:
- Protheses
noun, plural protheses [proth-uh-seez] /ˈprɒθ əˌsiz/ (Show IPA), for 2b, 3. 1. the addition of a sound or syllable at the beginning of a word, as in Spanish escala “ladder” from Latin scala. 2. Eastern Church. Also called proskomide. the preparation and preliminary oblation of the Eucharistic elements. the table on which this is done. […]
- Prothesis
noun, plural protheses [proth-uh-seez] /ˈprɒθ əˌsiz/ (Show IPA), for 2b, 3. 1. the addition of a sound or syllable at the beginning of a word, as in Spanish escala “ladder” from Latin scala. 2. Eastern Church. Also called proskomide. the preparation and preliminary oblation of the Eucharistic elements. the table on which this is done. […]
- Prothetic
noun, plural protheses [proth-uh-seez] /ˈprɒθ əˌsiz/ (Show IPA), for 2b, 3. 1. the addition of a sound or syllable at the beginning of a word, as in Spanish escala “ladder” from Latin scala. 2. Eastern Church. Also called proskomide. the preparation and preliminary oblation of the Eucharistic elements. the table on which this is done. […]
- Prothonotary
[proh-thon-uh-ter-ee, proh-thuh-noh-tuh-ree] /proʊˈθɒn əˌtɛr i, ˌproʊ θəˈnoʊ tə ri/ noun, plural prothonotaries. 1. a chief clerk or official in certain courts of law. 2. Roman Catholic Church. any of the seven members of the college of prothonotaries apostolic, charged chiefly with the registry of pontifical acts and canonizations. an honorary title for certain other prelates. […]
- Prothonotary-apostolic
noun, plural prothonotaries apostolic. 1. a member of the first college of prelates of the Roman Curia.