Polypodium virginianum

Rock polypody
Conservation status
	; Secure (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Polypodiineae
Family:	Polypodiaceae
Genus:	Polypodium
Species:	P. virginianum
Binomial name
	Polypodium virginianum; L.
Synonyms
	P. vinlandicum A. Love & D. Love,; P. vulgare L. var. americanum Hooker; P. vulgare L. var. virginianum (L.) D. C. Eaton;

Polypodium virginianum, commonly known as rock polypody, rock cap fern, or common polypody, is a small evergreen species of fern native to the Eastern United States and Canada. It generally grows on rocks and occasionally on tree roots in nature.

Description

Polypodium virginianum is a small rhizomatous fern with narrow leaves 8–40 centimetres (3.1–15.7 in) long and 3–6 centimetres (1.2–2.4 in) wide borne on smooth, scaleless petioles 3–15 centimetres (1.2–5.9 in). Leaves are evergreen, oblong and pinnatifid with acuminate tips.

Large, circular sori are prominently featured on the underside of fertile fronds in late summer and autumn. Sporangia are intermixed with long brown glandular hairs.[1]

Close up

Numerous sori on the underside of a leaf

Taxonomy

Polypodium virginianum has several synonyms including: P. vinlandicum A. Love & D. Love, P. vulgare L. var. americanum Hooker,[2] P. vulgare L. var. virginianum (L.) D. C. Eaton.[3] It is generally treated as distinct, though some have recommended it is equally well treated as a North American variety of the circumboreal Polypodium vulgare.[1]

This species is an allotetraploid of hybrid origin, the parents being Polypodium appalachianum and P. sibiricum.

Distribution and habitat

Polypodium virginianum typically grows on boulders, cliffs, and rocky slopes and does not need well-developed soil. It is common throughout eastern North America; its native distribution ranges from Newfoundland to Yukon south to Georgia, Alabama, and Arkansas.[1]

gollark: CPU usage on one core has already reached 100%.

gollark: My computer will not survive.

gollark: It is too late. I am opening Teams.

gollark: But in general, people didn't do very well on the literally-just-programming-to-a-simple-spec section of the exam, despite it being very easy. I can try and find the paper, but it *may* require MS Teams interaction, which will bring my computer to its knees.

gollark: This is admittedly not an unbiased sample, as (some offense, [REDACTED]) they were among the worst programmers in said group at this point.

References

Gleason, Henry A.; Cronquist, Arthur (1991). Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Bronx, NY: The New York Botanical Garden Press. ISBN 0-89327-365-1.
Esser, Karl; Kubitzki, Klaus; Runge, Michael; Schnepf, Eberhard; Ziegler, Hubert (eds.). Progress in Botany / Fortschritte der Botanik: Morphology - Physiology. p. 331. doi:10.1007/978-3-642-69985-6. ISBN 978-3-642-69985-6.
Eilers, Lawrence J.; Roosa, Dean M. (1994). The Vascular Plants of Iowa: An Annotated Checklist and Natural History. University of Iowa Press. p. 36. ISBN 0-87745-463-9.

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[Gleason_and_Cronquist_1991-1] Gleason, Henry A.; Cronquist, Arthur (1991). Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Bronx, NY: The New York Botanical Garden Press. ISBN 0-89327-365-1.

[2] Esser, Karl; Kubitzki, Klaus; Runge, Michael; Schnepf, Eberhard; Ziegler, Hubert (eds.). Progress in Botany / Fortschritte der Botanik: Morphology - Physiology. p. 331. doi:10.1007/978-3-642-69985-6. ISBN 978-3-642-69985-6.

[3] Eilers, Lawrence J.; Roosa, Dean M. (1994). The Vascular Plants of Iowa: An Annotated Checklist and Natural History. University of Iowa Press. p. 36. ISBN 0-87745-463-9.