Description, distribution and ecology of endemic Tasmanian quillwort, Isoetes jarmaniae, sp. nov. (Isoetaceae; Lycopodiopsida)

Autor:	Brunton, Daniel F., Garrett, Michael, Sokoloff, Paul C., Kantvilas, Gintaras
Rok vydání:	2021
Předmět:	education.field_of_study biology Ecology Sporangium Isoetaceae Population Context (language use) Biodiversity Plant Science biology.organism_classification Tracheophyta Taxon Lycopodiopsida Isoetes Megaspore Plantae education Ecology Evolution Behavior and Systematics Taxonomy Isoetales
Zdroj:	Phytotaxa. 522:27-37
ISSN:	1179-3163 1179-3155
Popis:	Isoetes jarmaniae sp. nov. is described as a new lycophyte endemic to Tasmania, Australia, where it is confined to peat-bound karstic wetlands in several river valleys in the south-west wilderness. While seemingly morphologically closest to I. drummondii, this quillwort has features that are globally uncommon in Isoetes and unknown in other Australasian taxa. Most notable are its markedly flattened, strongly recurved leaves and disproportionately large sporangium ligules that are more suggestive of South American than Australian taxa. As well, the exceptionally thin and wide (alate) megaspore equatorial ridge is swollen at suture intersections, presenting a slightly triangular shape suggestive of the Indian taxon I. udupiensis. The microspores of I. jarmaniae exhibit exceptionally, perhaps uniquely, fine-papillate ornamentation. An original key placing I. jarmaniae in context with the other Tasmanian Isoetes species is provided. This diminutive, apparently diploid species is evidently maintaining a self-sustaining population within a regionally unique habitat and small geographic range.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::330162d1a5a6d82f3e86ec31a6b67fb8 https://doi.org/10.11646/phytotaxa.522.1.3 Zobrazit plný text záznamu