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PELLIA

Pellia is a prostrate, dichotomously branched plant with a thin, dorsiventral structure featuring smooth rhizoids on the ventral surface. It can be monoecious or dioecious, with distinct reproductive structures including antheridia and archegonia. The sporophyte is characterized by a globose capsule covered by involucre and calyptra, containing spores and elaters.

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468 views2 pages

PELLIA

Pellia is a prostrate, dichotomously branched plant with a thin, dorsiventral structure featuring smooth rhizoids on the ventral surface. It can be monoecious or dioecious, with distinct reproductive structures including antheridia and archegonia. The sporophyte is characterized by a globose capsule covered by involucre and calyptra, containing spores and elaters.

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titasmallick96
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© © All Rights Reserved
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Pellia:

Vegetative Structure:
Plant body is thin, dorsiventral, prostrate, dichotomously branched,
with somewhat wavy margin. The dorsal surface is almost smooth and
a median midrib is prominent. On the ventral surface numerous
smooth, unicellular rhizoids are borne from under the midrib.

In T.S. through the thallus, following layers can be noticed:


(a) Upper and lower epidermis are present lower epidermis is with
numerous smooth rhizoids,

(b) In between the two epidermal layers there are compact


parenchymatous, chloroplast containing cells with a few scattered
fibrous cells. Usually the midrib portion is thicker (8 – 16 layers in
depth) than margins (2-5 layers in depth) (Fig 5.11).

Reproductive Structure:
Plants are either monoecious or dioecious. In the dioecious forms, the
male plant bears antheridia all along the dorsal surface of the midrib
while the archegonia develop in a cluster just behind the growing tip
on the dorsal side of the female plant. In monoecious forms, the
antheridia are behind the archegonia.

The mature antheridium is globose with a jacket one cell in thickness


and a multicellular short stalk. It lies at the bottom of the antheridial
chamber which is open on the dorsal surface by a pore. The mature
archegonium shows a venter containing the egg, a ventral canal cell
and 4 to 6 neck canal cells.

Sporogonium:
Sporophyte is covered by involucre and calyptra. Each sporophyte has
a distinct foot, seta and globose capsule. Capsule has two-layered
jacket cells of outer layer larger with radial walls thickened and cells of
inner layer with inner tangential wall thickened and numerous spores
and elaters. There is a distinct elaterophore (formed by a group of
elaters) at the base of each capsule (Fig 5.11).

Identification:
Thallus dorsiventrally flattened and prostrate, sporophyte simple and
with limited growth, columella absent.

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