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Chambers, T.C.; Farrant, P.A. 1996: Four subspecies of the fern Blechnum penna-marina (Blechnaceae: Pteridophyta). Fern Gazette 15(3): 91–100.

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Chambers, T.C.; Farrant, P.A. 1996: Four subspecies of the fern Blechnum penna-marina (Blechnaceae: Pteridophyta). Fern Gazette 15(3): 91–100.
Fern Gazette
Article

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KEY TO THE SUBSPECIES

1.
Plants small, not more than 28 cm tall; sterile pinnae constricted close to the rhachis and usually distinctly crenate
subsp. microphyllum
Plants larger, up to 73 cm tall; pinnae adnate to the rhachis with broad bases, entire or very slightly crenate
2
2.
Plants large and robust, fronds up to 73 cm tall and 3 cm wide
subsp. boliviana
Plants not as large, fronds up to 40 cm tall and 2.7 cm wide
3
3.
Stipe dark purplish black, dark colour of stipe usually extending into rhachis; pinnae 6-19 × 3-6 mm and tending to be imbricate; living plants rich dark green
subsp. penna-marina
Stipe dark reddish brown at base, usually becoming stramineous below rhachis; pinnae 3.5-13 × 2-6 mm and only tending to be imbricate when growing under harsh exposed conditions; living plants glaucous green to rich green, often with a characteristic sheen especially in exposed localities
subsp. alpina

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4c17aaae-8714-44ff-9f76-9cb387c3609e
reference
Names_Plants
19 October 2005
21 March 2007
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