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NZ Plants
Marchantia macropora
Family: Marchantiaceae
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Plant
L Jensen
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Branching thallus, dorsal surface
L Jensen
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Thallus tip
L Jensen
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Air pore, exterior view
L Jensen
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Air pore, interior view
L Jensen
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Air pore detail
R Gardner
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Gemma cup with vegetative propagules (gemmae)
L Jensen
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Branching thallus, ventral surface with rhizoids and scales
L Jensen
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Thallus tip with ventral scales
L Jensen
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Ventral scale with terminal appendage
R Gardner
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Female thallus with archegoniophore consisting of a filamentous extension of the thallus terminating in a disc
L Jensen
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Disc from below, sporangium
L Jensen
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Disc in side view, with attached sporophyte terminating in a sporangium
L Jensen
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Marchantia macropora has a distinctive strap-shaped thallus up to 6 cm long and 5-8 mm wide. The dorsal epidermis has very large air pores, each with a hydrophobic cuticular ledge protecting against water loss; each pore leads into large sub-epidermal air chamber. Asexual propagules (gemmae) are formed in large gemmae cups with finely-toothed margins. Female and male gametangia are borne on erect branches of the thallus called archegoniophores (female) and antheriodiophores (male).
Widespread in the North Island in moist locations.