Elaphoglossum hainanense
From Wikipedia, the free encyclopedia
| Elaphoglossum hainanense | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | Polypodiophyta |
| Class: | Polypodiopsida |
| Order: | Polypodiales |
| Suborder: | Polypodiineae |
| Family: | Dryopteridaceae |
| Genus: | Elaphoglossum |
| Species: | E. hainanense |
| Binomial name | |
| Elaphoglossum hainanense Y.J. Yang, J.P. Shu & Y.H. Yan | |
Elaphoglossum hainanense is a species of fern in the family Dryopteridaceae endemic to Hainan Island, China.[1]
Elaphoglossum hainanense has long creeping rhizomes that are 3 to 5 millimeters thick and densely covered with scales. The fronds are spaced 3 to 5 millimeters apart along the rhizome. Phyllopodia are present and measure 1 to 2 centimeters in length. The rhizome scales are thin, dark brown, and measure 3 to 5 millimeters long by 1 millimeter wide. Each scale narrows to a hair like tip and has a ciliate margin.[1]
The sterile fronds have a stipe 6 to 8 centimeters long. The lamina is narrowly lanceolate, thin but firm in texture, and measures 11 to 14 centimeters long by 1.5 centimeters wide. The lamina is widest at or below the middle and narrows gradually toward the apex. The apex is acute and the base is narrowly cuneate and decurrent as a narrow wing. A thin cartilaginous edge approximately 0.5 millimeters wide borders the lamina. The lateral veins are raised on the upper surface and distinct and prominent. The upper surface is glabrous and the lower surface has scattered brown stellate trichomidia approximately 0.4 millimeters across. Hydathodes are absent.[1]
The fertile fronds have a stipe 4 to 6 centimeters long. The lamina measures 10 to 12 centimeters long by 1.5 centimeters wide and is similar in shape to the sterile fronds. Intersporangial scales are absent.[1]
Molecular phylogenetic analysis based on chloroplast DNA sequences places E. hainanense within Elaphoglossum sect. Elaphoglossum. The analysis shows that samples of E. hainanense form a distinct clade that is sister to E. acrostichoides. The species is not closely related to E. yunnanense, which belongs to Elaphoglossum sect. Lepidoglossa.[1]
Etymology
The specific epithet hainanense refers to Hainan Province, China, where the species was discovered. The Chinese name for the species is 海南舌蕨 (hǎi nán shé jué).[1]