Cystopteris is a genus of ferns in the family Cystopteridaceae. These are known generally as bladderferns or fragile ferns. They grow in temperate areas worldwide. This is a very diverse genus and within a species individuals can look quite different, especially in harsh environments where stress stunts their growth. They hybridize easily with each other and identifying an individual can be challenging. In general these are rhizomatous perennials which grow in rocks or soil. Their leaves are multiply pinnate, in that each leaflet is divided into smaller parts. The sori are usually rounded and covered in an inflated bladder-like indusium.
Phylogeny
This genus includes the following species:
Hybrids
The hybrid species include:
- C. fragilis (C. "hemifragilis" ÃÂ C. reevesiana; allotetraploid)
- C. laurentiana (C. bulbifera ÃÂ C. fragilis; allohexaploid)
- C. tennesseensis (C. bulbifera ÃÂ C. protrusa; allotetraploid)
- C. tenuis (C. "hemifragilis" ÃÂ C. protrusa; allotetraploid)
- C. utahensis (C. reevesiana ÃÂ C. bulbifera; allotetraploid)
Non-species hybrids include:
- Cystopteris ÃÂ christii <small>Hahne 1904</small> (C. fragilis ÃÂ C. montana)
- Cystopteris ÃÂ illinoensis <small>Moran 1982</small> (C. bulbifera ÃÂ C. tenuis; allotriploid)
- Cystopteris ÃÂ montserratii <small>Prada & Salvo 1985</small> (C. dickieana ÃÂ C. fragilis)
- Cystopteris ÃÂ vidae <small>Fraser-Jenkins & Parris 2021</small> (C. alpina ÃÂ C. fragilis)
- Cystopteris ÃÂ wagneri <small>Moran 1983</small> (C. tennesseensis ÃÂ C. tenuis; allo-allotetraploid)
- Cystopteris fragilis ÃÂ Cystopteris tenuis (allo-allotetraploid)
- Cystopteris protrusa ÃÂ Cystopteris tennesseensis (allotriploid)
References
External links