With the advent of cytological analysis, Scanning Electron Microscopy, therecognition of sterile hybrids, improved access to wild populations andincreasingly comprehensive molecular investigations, there has been a revolutionin Isoetes taxonomy in recent times. The last 40 years have seen an almost 100%increase in the diversity documented during the previous two centuries. Fourgeographic areas account for over 90% of this diversity: northern-central SouthAmerica, eastern North America, western Eurasia (including the northernMediterranean) and South to Tropical Africa. There is a significant globalconservation concern for Isoetes, with many taxa being rare (known from one toa handful of populations) and some known only from herbarium specimens. Thetaxa of the extraordinary rock-outcrop pools and the ephemeral wetlands foundin disjunct areas around the world appear to be particularly vulnerable to habitatdestruction. We expect 100 or more new taxa to be described in coming years.Such taxonomic productivity will require more systematic cytological andmolecular investigations to be undertaken. It also requires the assembly of a largerglobal inventory of high-quality voucher specimens to provide the material forsuch investigations.
|Numero di pagine||25|
|Rivista||THE FERN GAZETTE|
|Stato di pubblicazione||Published - 2018|
All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Plant Science