Licorice fern Polypodium
glycyrrhiza |
|
Left photo courtesy of Right photo courtesy of Pacific Rim
Native Plants Nursery’s fern page: http://www.hillkeep.ca/ferns.htm |
Range
|
Found in moist temperate forests of the Pacific
coast, this epiphyte ranges as far south as Marin county and as far north as
coastal |
Distribution photo courtesy of Flora of
North America: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233500977 |
Climate,
Elevation
Low elevation, below 1,800 ft (13, 4). P. glycyrrhiza’s distribution indicates it
prefers a moist temperate region with warm, wet winters, cool, wet summers, and
dense fog. “All
inland locations are associated with the riparian areas of large streams that
have coastal environments” (4).
Local occurrence
(where, how common)
Look
for this fern on rocks, logs and the braches of bigleaf maple and alder trees in
shady lowland forests throughout its range (1,
2)
Habitat
preferences
The
epiphytic P. glycyrrhiza will be spotted growing on bigleaf maple trees in low
elevation forests. Can also be found on
wet, mossy ground, logs and sometimes forms large sheets over moist rocks (7). Prefers partial shade to full shade (10). However it is also documented that it can
grow in no shade at all for short periods, and that despite its requirement for
moist soil, it can tolerate brief drought (11, 12). “It needs to
be in the ground or planted on a rotted log in areas with extended periods of
frost or the rhizomes will freeze” (http://www.fancyfronds.com).
Plant strategy
type/successional stage (stress-tolerator, competitor, weedy/colonizer, seral, late successional)
The
habitat preferences of P. glycyrrhiza indicate that it is not a stress
tolerator. As it is highly associated
with bigleaf maple, it would most likely occur in older primary succesional
forests in which this tree species is well established. As an epiphyte, it may unlikely compete with
the host plant by crowding out its leaves.
Can also be found in mid-seral Douglas fir and
grand fir cover types (4)
Associated
species
Associates with mossy Bigleaf maple (pojar), Douglas-fir, grand fir (4), salix spp. (3), and other moist forest species.
May be collected
as: (seed, layered, divisions, etc.)
Collect
and propagate using divisions and spores.
Collection
restrictions or guidelines
Collect spores in the late fall and spring (9).
Sow spores thinly in pots covered with glass or plastic (an aquarium
with a glass cover will work (14)) to
create a moist, humid environment, allowing the gametophytes to fertilize, then
carefully place small clumps of the plantlets into individual pots and keep
humid. Plant in a
sheltered position when plants are 2 years old (12). Make sure your plants do not get moldy when
under plastic or glass (6).
Use division in the spring (12). This
fern goes dormant in the summer and can be difficult to find in this time (13), so mark your plants to avoid destroying
them if you will be modifying the site then.
Seed germination
(needs dormancy breaking?)
For
the spore to germinate, it must be kept moist at all times (14). Spores
do not need dormancy breaking, and can be sown as soon as they are ripe. Smith and Robinson kept their cultures at 23
degrees Celsius under continuous fluorescent light at 250 lux
(15).
Seed life (can
be stored, short shelf-life, long shelf-life)
With
increasing spore age, the percentage of viable spores decreases, with an
increasing delay in germination.
Immediately after collection, spores germinated at about 89.6%, while
after 4 years of storage, germination declined to 53.7%. (15).
Recommended seed
storage conditions
Smith
and Robinson stored their spores at 4 degrees Celsius in an air-tight
screw-capped vial in their study on age vs. spore viability in P.
glycyrrhiza. The spores had a water
content of 6.5% (15)
Propagation
recommendations (plant seeds, vegetative parts, cuttings, etc.)
Division
would be the simplest form of propagation.
However, if that is not possible, propagate using spores.
Soil or medium
requirements (inoculum necessary?)
Sow
in high densities on the surface of a humus rich, sterilized soil – this plant
does not tolerate heavy clay soils or soils that lack sufficient nutrients (12). Any
fairly porous medium such as peat moss, equal parts sand and shredded organic
material is suitable (14).
Installation
form (form, potential for successful outcomes, cost)
As
mentioned before, wait until the plants are about 2 years old before planting
out, and make sure they are placed in a shady area which will receive
sufficient moisture (12).
Recommended
planting density
None
indicated, however, these plants are acclimated to growing in mats and in
shade, so consider this when installing.
Care
requirements after installed (water weekly, water once etc.)
Water
often enough, depending on climate, but do not saturate. Keep the plant moist at all times, especially
during establishment period. While P.
glycyrrhiza tolerates drought, it will not survive for long. This plant normally dries in the summer
during its dormancy.
Normal rate of
growth or spread; lifespan
P.
glycyrrhiza grows to 0.3 m by 0.3 m (11). Height 10-40 cm and spread
40-50 cm. (10). Growth rate and overall lifespan
undetermined.
Sources cited
1)
"Ferns and Related Species." Flora of the
Northwest. Washington Trails Association.
06 May. 2005 http://www.wta.org/~wta/cgi-bin/wtaweb.pl?3+fz+flora+ferns.
2)
"Ferns of the Fog Forests...Ancient Plants Still Kicking
Along." McDaniel College Biology Department. 06
May. 2005 http://wwwfac.mcdaniel.edu/Biology/wildamerica/redwoodforest/Efernredw.html
3)
"
4)
"Licorice Fern."
5)
"Licorice Fern." UCSC Arboretum.
6) Ostrovsky, Nick. "Plant Data Sheet -
Sword Fern (Polystichum munitum)."
Native Plants and Their Restoration Specifications.
7) Pojar, Jim and Andy
MacKinnon. “Licorice
Fern”. Plants
of the
8)
"Polypodium glycyrrhiza." Fern Database.
Fancy Fronds Nursery. 06 May. 2005 http://www.fancyfronds.com/store/getdisweed.cfm?ItemID=72.
9)
"Polypodium glycyrrhiza." Flora of
10)
"Polypodium glycyrrhiza - Licorice fern." Native
Ferns. NATS Naturals Nursery. 06 May. 2005 http://www.natsnaturals.com/Pages/Native2.htm.
11)
"Polypodium glycyrrhiza." Plant for a
Future Database. 06 May. 2005 http://www.ibiblio.org/pfaf/cgi-bin/arr_html?Polypodium+glycyrrhiza&CAN=COMIND.
12)
"Polypodium glycyrrhiza." The Plant
Archives. Gardenbed.com. 06 May.
2005 http://gardenbed.com/51/5064_pro.asp.
13)
"Polypodium glycyrrhiza." Your
14)
"Propagation of Ferns From Spore." Tree Ferns Down Under. 06 May. 2005
http://www.geocities.com/rlhill47/spores.html.
15)
Smith, D.L. "The Effects of Spore Age on Germination and
Gametophyte Development in Polypodium vulgare L.." New Phytologist
74.1 (1975): 101-108. Stable URL: http://links.jstor.org/sici?sici=0028-646X%28197501%2974%3A1%3C101%3ATEOSAO%3E2.0.CO%3B2-W
Data compiled by
(student name and date)
Ivona
Kaczynski,