| 词条 | Jensenia |
| 释义 |
| name = Jensenia | image = | image_width = 240px | image_caption = | regnum = Plantae | divisio = Marchantiophyta | classis = Jungermanniopsida | ordo = Metzgeriales | familia = Pallaviciniaceae | genus = Jensenia | genus_authority = Lindb. 1868 | subdivision_ranks = Species | subdivision =Jensenia angulata Jensenia canicruria Jensenia decipiens Jensenia difformis Jensenia erythropus Jensenia lewisi Jensenia pisicolor Jensenia spinosa | 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 characteristicsJensenia 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 morphologyMale 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. References1. ^1 2 {{cite journal |last1=Perold |first1=S. M. |title=The hepatic, Jensenia spinosa (= Pallavicinia stephanii: Pallaviciniaceae), in southern Africa |journal=Bothalia |date=1993 |volume=23 |issue=2 |pages=223–229 |url=http://abcjournal.org/index.php/ABC/article/viewFile/806/757 |accessdate=12 March 2015}} {{Taxonbar|from=Q6179988}}{{Bryophyte-stub}}2. ^{{cite journal |last1=Grolle |first1=R. |title=Jensenia statt Makednothallus, Revue bryologique et lichénologique |journal=Notulae hepaticologicae|date=1964|volume=33|pages=227–229}} 3. ^{{cite journal|last1=Engel|first1=J. J.|title=Falkland Islands (Islas Malvinas). Hepaticae and Anthocerotophyta. A taxonomic and phytogeographic study. |journal=Fieldiana: Botany |date=1990 |volume=25 |pages=1–209}} 4. ^{{cite journal |last1=Grolle |first1=R. |last2=Piippo |first2=S. |title=Bryophyte flora of the Huon Peninsula, Papua New Guinea. XVI |journal=Acta Botanica Fennica |date=1986 |volume=133 |pages=59–79}} 1 : Metzgeriales |
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