Eupolypods I
| Eupolypods I | |
|---|---|
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| Common Polypody, Polypodium vulgare | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Pteridophyta |
| Class: | Polypodiopsida / Pteridopsida (disputed) |
| Order: | Polypodiales |
| (unranked): | Eupolypods I |
| Families | |
|
Polypodiaceae | |
Eupolypods I is a clade of ferns in the order Polypodiales, class Polypodiopsida.[1] It probably diverged from Eupolypods II during the mid-Cretaceous. The divergence is supported by both molecular data and an often overlooked morphological characteristic which lies in the vasculature of the petiole. Most species that make up the Eupolypods I clade have three vascular bundles. The only exceptions are the Grammitid ferns which have one, and the genus Hypodematium which has two. This differs from Eupolypods II which mostly have two vascular bundles (except the well-nested blechnoid ferns which generally have at least three).[2]
Phylogenic relationships
The following phylogram for the eupolypods I is based on Lehtonen, 2011[3] and Christenhusz et al., 2011.[4]
| eupolypods I |
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References
- ↑ Alan R. Smith, Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider & Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon 55 (3): 705–731. doi:10.2307/25065646.
- ↑ S. Blair Hedges; Sudhir Kumar (2009). The Timetree of Life. US: Oxford University Press. pp. 154–156. Retrieved 23 August 2011.
- ↑ Samuli Lehtonen (2011). "Towards Resolving the Complete Fern Tree of Life" (PDF). PLoS ONE 6 (10): e24851. doi:10.1371/journal.pone.0024851. PMC 3192703. PMID 22022365.
- ↑ Maarten J. M. Christenhusz, Xian-Chun Zhang & Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa 19: 7–54.