Treubiaceae

The Treubiaceae are a family of liverworts with only two genera and put its own order Treubiales and class Treubiopsida dar.

Features

The Treubiaceae have an approximately ten centimeters long thallus. This is lobed and neither clear nor thallös foliös. On the top sit scaly bodies ( Dorsalschuppen ). Among these, the gametangia are formed. This unique within the Moose structure is interpreted in different ways: on the one hand as two lobes of a leaf, on the other, as an intermediate structure between thallus and leafy plant. The thallus has complex oil cells and Zäpfchenrhizoide, characteristics of Marchantiopsida. The position of gametangia in leaf axils is a feature of Jungermanniopsida. Characteristics that shares the group with any other, are a four-sided apical cell and ventral Schleimpapillen. The Blepharoplast, a structure of the sperm, similar to that of Haplomitrium. The connection between sporophyte and gametophyte takes a middle position between the shapes of Marchantiopsida and Jungermanniopsida.

System

The group was asked earlier as a family in the order Metzgeriales. However, the group has features of both the Marchantiopsida as the Jungermanniopsida. Also, phylogenetic trees represent the Treubiales to the base of the liverworts. This is interpreted to the effect that Treubia or their ancestors stood at the starting point of the evolution of the liverwort groups.

There are only two genera:

• Treubia with six species
• Apotreubia with four types

From the Carboniferous Treubiites has been described kidstonii, which is very similar to the modern species. The relationship temporarily adopted but is rejected today.

Occurrence

The genus Treubia is common in parts of the former Gondwana continent, Apotreubia is native to India and on both sides of the Pacific in East Asia and North America.