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WRA Species Report Family: Blechnaceae Taxon: Blechnum appendiculatum Synonym: Blechnum occidentale var. minor Hook. Common Name: palm fern Blechnum occidentale var. pubirhachis Rosen hammock fern Questionaire : current 20090513 Assessor: Chuck Chimera Designation: H(Hawai'i) Status: Assessor Approved Data Entry Person: Chuck Chimera WRA Score 17 101 Is the species highly domesticated? y=-3, n=0 n 102 Has the species become naturalized where grown? y=1, n=-1 103 Does the species have weedy races? y=1, n=-1 201 Species suited to tropical or subtropical climate(s) - If island is primarily wet habitat, then (0-low; 1-intermediate; 2- High substitute "wet tropical" for "tropical or subtropical" high) (See Appendix 2) 202 Quality of climate match data (0-low; 1-intermediate; 2- High high) (See Appendix 2) 203 Broad climate suitability (environmental versatility) y=1, n=0 y 204 Native or naturalized in regions with tropical or subtropical climates y=1, n=0 y 205 Does the species have a history of repeated introductions outside its natural range? y=-2, ?=-1, n=0 ? 301 Naturalized beyond native range y = 1*multiplier (see y Appendix 2), n= question 205 302 Garden/amenity/disturbance weed n=0, y = 1*multiplier (see n Appendix 2) 303 Agricultural/forestry/horticultural weed n=0, y = 2*multiplier (see n Appendix 2) 304 Environmental weed n=0, y = 2*multiplier (see y Appendix 2) 305 Congeneric weed n=0, y = 1*multiplier (see Appendix 2) 401 Produces spines, thorns or burrs y=1, n=0 n 402 Allelopathic y=1, n=0 403 Parasitic y=1, n=0 n 404 Unpalatable to grazing animals y=1, n=-1 405 Toxic to animals y=1, n=0 n 406 Host for recognized pests and pathogens y=1, n=0 407 Causes allergies or is otherwise toxic to humans y=1, n=0 n 408 Creates a fire hazard in natural ecosystems y=1, n=0 n 409 Is a shade tolerant plant at some stage of its life cycle y=1, n=0 y 410 Tolerates a wide range of soil conditions (or limestone conditions if not a volcanic island) y=1, n=0 y 411 Climbing or smothering growth habit y=1, n=0 n Print Date: 11/15/2012 Blechnum appendiculatum (Blechnaceae) Page 1 of 6 412 Forms dense thickets y=1, n=0 y 501 Aquatic y=5, n=0 n 502 Grass y=1, n=0 n 503 Nitrogen fixing woody plant y=1, n=0 n 504 Geophyte (herbaceous with underground storage organs -- bulbs, corms, or tubers) y=1, n=0 n 601 Evidence of substantial reproductive failure in native habitat y=1, n=0 n 602 Produces viable seed y=1, n=-1 y 603 Hybridizes naturally y=1, n=-1 604 Self-compatible or apomictic y=1, n=-1 605 Requires specialist pollinators y=-1, n=0 n 606 Reproduction by vegetative fragmentation y=1, n=-1 y 607 Minimum generative time (years) 1 year = 1, 2 or 3 years = 0, 4+ years = -1 701 Propagules likely to be dispersed unintentionally (plants growing in heavily trafficked y=1, n=-1 areas) 702 Propagules dispersed intentionally by people y=1, n=-1 y 703 Propagules likely to disperse as a produce contaminant y=1, n=-1 704 Propagules adapted to wind dispersal y=1, n=-1 y 705 Propagules water dispersed y=1, n=-1 y 706 Propagules bird dispersed y=1, n=-1 n 707 Propagules dispersed by other animals (externally) y=1, n=-1 708 Propagules survive passage through the gut y=1, n=-1 801 Prolific seed production (>1000/m2) y=1, n=-1 y 802 Evidence that a persistent propagule bank is formed (>1 yr) y=1, n=-1 803 Well controlled by herbicides y=-1, n=1 804 Tolerates, or benefits from, mutilation, cultivation, or fire y=1, n=-1 805 Effective natural enemies present locally (e.g. introduced biocontrol agents) y=-1, n=1 n Designation: H(Hawai'i) WRA Score 17 Print Date: 11/15/2012 Blechnum appendiculatum (Blechnaceae) Page 2 of 6 Supporting Data: 101 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Is the species highly domesticated? No evidence] "This fern has uniformly been Allies. University of Hawaii Press, Honolulu, HI called Blechnum occidentale L. since it was first reported in Hawaii; however, the rachises of B. occidentale are entirely glabrous but those of B. appendiculatum Willd. are minutely pubescent and glandular, as is the naturalized Hawaiian species. Blechnum appendiculatum Willd., from the American Tropics, is part of the taxonomically difficult B. occidentale complex. A. R. Smith, who is working on regional floras of the Central and South America area, has found that the name B. gJandulosum Link, which has been used for this fern, must be replaced by the legitimate, older name that has priority, B. appendiculatum Willd. 102 2012. WRA Specialist. Personal Communication. NA 103 2012. WRA Specialist. Personal Communication. NA 201 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Species suited to tropical or subtropical climate(s) - 2-High] "Represented in Allies. University of Hawaii Press, Honolulu, HI Hawaii by a single widespread naturalized species from Mexico and tropical Central and South America." 202 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Quality of climate match data 2-High] Allies. University of Hawaii Press, Honolulu, HI 203 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Broad climate suitability (environmental versatility)? Yes. Environmentally Allies. University of Hawaii Press, Honolulu, HI versatile. Elevation range exceeds 1000 m] "Common as clones forming large colonies in closed-canopy mesic forests, especially on rock or rocky substrates, and occurring in all but the most extreme habitats, 30-1,560 m, all major islands." 204 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Native or naturalized in regions with tropical or subtropical climates? Yes] Allies. University of Hawaii Press, Honolulu, HI "Represented in Hawaii by a single widespread naturalized species from Mexico and tropical Central and South America." 205 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Does the species have a history of repeated introductions outside its natural Allies. University of Hawaii Press, Honolulu, HI range? Hawaiian Islands] "This tropical American fem, first collected in Hawaii in 1918, has escaped from gardens and spread extensively." 205 2012. Dave's Gardern. PlantFiles: Hammock [Does the species have a history of repeated introductions outside its natural Fern - Blechnum appendiculatum. range? California] "This is a spreading groundcover fern that is great for shady http://davesgarden.com/guides/pf/go/57620/ Southern California gardens... sorry, can't comment on the rest of the country. It [Accessed 15 Nov 2012] is particularly nice in the spring when all the new reddish fronds shoot up around the garden. It does swarm and can become invasive, but stays low and is easy to pull up. It is NOT easy to completely eradicate, though I have never felt I had to. Some growers just 'mow' it down in the fall and by late spring it's all back and then some (tends to get a bit ratty over a cold, wet winter). It was just renamed recently, and before was known as B occidentalis." 301 2002. Wilson, K.A.. Continued Pteridophyte [Naturalized beyond native range? Yes] "Blechnum appendiculatum Willd.—The Invasion of Hawaii. American Fern Journal. 92(2): Blechnum species that grows in Hawaii has been known as B. occidentale L. 179-183. since its occurrence was first reported. Recent studies, however, have shown that the rachises of B. occidentale are glabrous on the abaxial surface, whereas those of B. appendiculatum are pubescent and glandular. Blechnum appendiculatum also differs in having more pinnae and darker rhizome scales than does B. occidentale (A. R. Smith, pers. comm.; see also Hoshizaki & Moran, 2001, p. 216). The species naturalized in Hawaii is B. appendiculatum (syn. B. glandulosum Kaulf. ex Link). Both species are natives of tropical America." … "TABLE 1. Naturalized ferns and fern allies in Hawai’i arranged by year of their first collection." [Blechnum appendiculatum recorded on Kaua’I, O’ahu, Molokai, Maui, Hawai’i] 302 1996. Wilson, K.A.. Alien Ferns in Hawaii. Pacific [Garden/amenity/disturbance weed? A disturbance adapted weed with Science. 50 (2): 127-141. environmental impacts] "It is now a common weedy fern along trail sides, stream banks, forested slopes, and gulches on all islands, often growing in solid stands." 303 2012. Randall, R.P.. A Global Compendium of [Agricultural/forestry/horticultural weed? Environmental Weed] Weeds. 2nd Edition. Department of Agriculture and Food, Western Australia 304 2003. Palmer, D.D.. Hawaii's Ferns and Fern [Environmental weed? Yes] "This tropical American fem, first collected in Hawai' i Allies. University of Hawaii Press, Honolulu, HI in 1918, has escaped from gardens and spread extensively. It is a serious weed that competes with many native fern species and is especially threatening to species of the rare endemic genus Diellia." Print Date: 11/15/2012 Blechnum appendiculatum (Blechnaceae) Page 3 of 6 304 2004. Aguraiuja, R./Moora, M./Zobel, M.. [Environmental weed? Yes. Competes with native Diellia spp.] "From 36 Population stage structure of Hawaiian endemic investigated sites on four islands, Diellia ferns were found growing in 24 sites fern taxa of Diellia (Aspleniaceae): implications (Table 1, Fig. 1). Among sites without recorded finds, the habitat of Puu Ka Pele for monitoring and regional dynamics. Canadian on Kauai (D. pallida) was significantly degraded. The site at Makaha on Kauai (D. Journal of Botany. 82: 1438-1445. pallida) was completely overgrown by Erigeron karvinskianus DC and Blechnum appendiculatum Willd." 304 2008. Aguraiuja, R./Zobel, M./Zobel, K./Moora, [Environmental weed? Yes.
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