prothallus वाक्य
उदाहरण वाक्य
मोबाइल
- The prothallus development is of the " Adiantum " type.
- It has a black or bluish or greenish prothallus.
- The prothallus is usually absent when growing on rock.
- A rim of dark tissue ( prothallus ) may surround the edges of the lichen.
- The prothallus is red to whitish in the inner part, red the in outer part.
- The cordate prothallus are usually smaller with thinner midribs than that of other members of Polypodiaceae.
- The prothallus is either absent or vestigial, with areoles sometimes being contiguous and sometimes scattered.
- Young fern sporelings can often be found with the prothallus gametophyte still attached at the base of their fronds.
- A thin strip of prothallus sometimes is at the outer edge, forming a narrow dark zone ( fimbriate ).
- In ferns the gametophyte is a small flattened autotrophic prothallus on which the young sporophyte is briefly dependent for its nutrition.
- The resulting conchospore germinates to form a tiny prothallus with rhizoids, which develops to a cm-scale leafy thallus.
- This eventually results in the formation of a notch at the anterior edge of the prothallus, giving it a roughly heart-shaped appearance ( cordate ).
- In contrast to the typical heart-shaped fern prothallus, " T . boschianum " gametophytes are filamentous and resemble colonies of green algae or moss protonemata.
- The gametophyte of " L . obscurum " is disc shaped prothallus, measuring an average of 1.5 cm ( 0.6 inches ) in diameter.
- It has short, inflated looking elongate 1-2 mm and . 3-. 1 mm wide lobes that have an abrupt margin at the edge, and no prothallus.
- The prothallus and apothecia are black, while the thallus areoles are brown . " Atro " is from Latin for " black " and " brunnea " for " brown ".
- In common with all ferns, " T . boschianum " exhibits a gametophyte stage in its life cycle ( alternation of generations ) and develops a haploid reproductive prothallus as an independent plant.
- In common with all ferns, " H . tunbrigense " exhibits a gametophyte stage in its life cycle ( alternation of generations ) and develops a haploid reproductive prothallus as an independent plant.
- Distinguished for his original work on'Lycopodium, Tmesipteris, Phylloglossum'and the Hymenphyllaceae ( Trans NZ Institute : Annals of Botany ); the first to give a complete account of the prothallus and embryogeny of'Tmesipteris '.
- (2 ) Synthesising 13 F1 hybrids in 4 fern genera ( an achievement in itself judged against the chances of self-fertilisation in a fern prothallus bearing both antheridia and archegonia ) and which do not lend themselves to emasculation and, therefore, ensure self-fertilisation ) and meiotic analysis of these hybrids, have led him to postulate:
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