Rebouliaceae

Some botanists use the name Aytoniaceae for this family.

Asterellaaustralis0821a

Asterella australis

Found on damp partially shaded banks.

It could be mistaken for a Marchantia, but the thallus is more ribbon-like.

The tall structures are fruiting bodies called carpophores or carpocephala.

Asterellaaustralis0822a

The white lacey structures coming from underneath the carpophores are the perianths and the black structure inside those are the capsules of the sporophytes.

Asterellaaustralis1326a

The dark purplish patches at the tips of the thallus are the androecia - the males parts.

Rebouliahemispheria1136a

Reboulia hemisphaerica

The small roundish structures are immature archegoniophores containing an egg which, after fertilisation, will develop into a sporophyte containing spores.

The other dark spots at the tip of the thallus are the antheridiophores where the sperm are produced.

The little white dots on the thallus are pores which open into chambers, facilitating gas exchange.

Rebouliahemispherica017aa

Showing the archegoniophores at a more developed stage.

Reboulia1aa

This image shows three archegoniophores at different stages of development. The sporophyte is the round structure which becomes black on maturity.

Reboulia12a

This image shows one of many thousands of spores from the sporophyte. It has a reticulated (patterned) surface. The long structure with spirals is an elater, the shape of which changes on variations in humidity and adds in the discharge and dispersal of the spores.

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