Jensenia

Jensenia is a bryophyte plant genus in the liverwort family Pallaviciniaceae. It has been treated as a subgenus of Pallavicinia by several authors, though a set of features seems to set it apart as a genus.^[1] The six^[2] or seven^[3] species of the genus belong to a southern, possibly Gondwana element.^[1]

Jensenia
Jensenia erythropus. a bunch of moss, b single plant, c axis with rhizoids, d cross section with xylem and mycorrhizal fungi (glomeromycota) en the parenchym, e Arbuscle, f Vesicle, g Rhizoid with hypha
Scientific classification
Kingdom:	Plantae
Division:	Marchantiophyta
Class:	Jungermanniopsida
Order:	Pallaviciniales
Family:	Pallaviciniaceae
Genus:	Jensenia Lindb. 1868
Species
Jensenia angulata Jensenia canicruria Jensenia decipiens Jensenia difformis Jensenia erythropus Jensenia lewisi Jensenia pisicolor Jensenia spinosa
Synonyms
Makednothallus Mittenia

General characteristics

Jensenia liverworts are dioicous. Compared to Pallavicinia liverworts,^[1][4] their thallus grows erect, and branches tree-like, rather than trailing the ground. The thallus is perched on an ascending stipe which grows from a creeping rhizome. Slime papillae are absent from the thallus margin, though locally present elsewhere. The midrib of the thallus is broad but ill-defined.

Reproductive morphology

Male reproductive organs are scattered over the thallus's dorsal surface, while female organs are specifically placed near a bifurcation of the frond. The pseudoperianth, a tube of thallus tissue protecting the archegonia, is basally fused with the calyptra. Following fertilization, the sporophyte is enveloped by three structures: the cup-shaped involucre, cylindrical pseudoperianth and the calyptra. The spore surfaces are irregularly fasciated.