Biology:Jensenia
| Jensenia | |
|---|---|
| File:Jensenia neuAM.tif | |
| 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 |
| Subfamily: | Pallavicinioideae |
| Genus: | Jensenia Lindb. 1868 |
| Species | |
|
Jensenia angulata | |
| Synonyms | |
| |
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]
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.
References
- ↑ 1.0 1.1 1.2 Perold, S. M. (1993). "The hepatic, Jensenia spinosa (= Pallavicinia stephanii: Pallaviciniaceae), in southern Africa". Bothalia 23 (2): 223–229. http://abcjournal.org/index.php/ABC/article/viewFile/806/757. 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.
Wikidata ☰ Q6179988 entry
 |  |
