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 | |
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| 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 
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| Kingdom: | Plantae |
| Division: | Marchantiophyta |
| Class: | Jungermanniopsida |
| Order: | Pallaviciniales |
| Family: | Pallaviciniaceae |
| Genus: | Jensenia Lindb. 1868 |
| Species | |
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Jensenia angulata | |
| Synonyms | |
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General characteristics
editJensenia 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
editMale 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.
References
edit- ^ a b c Perold, S. M. (1993). "The hepatic, Jensenia spinosa (= Pallavicinia stephanii: Pallaviciniaceae), in southern Africa". Bothalia. 23 (2): 223–229. Retrieved 12 March 2015.
- ^ Grolle, R. (1964). "Jensenia statt Makednothallus, Revue bryologique et lichénologique". Notulae hepaticologicae. 33: 227–229.
- ^ Engel, J. J. (1990). "Falkland Islands (Islas Malvinas). Hepaticae and Anthocerotophyta. A taxonomic and phytogeographic study". Fieldiana: Botany. 25: 1–209.
- ^ Grolle, R.; Piippo, S. (1986). "Bryophyte flora of the Huon Peninsula, Papua New Guinea. XVI". Acta Botanica Fennica. 133: 59–79.
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