Crepidomanes minutum

Crepidomanes minutum is small fern in the filmy fern family which grows throughout the Pacific. It is commonly referred to as tiny bristle fern.[2] The specific epithet 'minutus' means small in latin, referring to the small fronds [3]

Crepidomanes minutum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Hymenophyllales
Family: Hymenophyllaceae
Genus: Crepidomanes
Species:
C. minutum
Binomial name
Crepidomanes minutum
(Blume) K. Iwats.
Synonyms[1]
  • Gonocormus australis Ching
  • Gonocormus bonincola (Nakai) Tagawa
  • Gonocormus diffusus (Blume) Bosch
  • Gonocormus matthewii (Christ) Ching
  • Gonocormus minutus (Blume) Bosch
  • Gonocormus prolifer (Blume) Prantl
  • Gonocormus saxifragoides (C. Presl) Bosch
  • Gonocormus siamensis Tagawa & K. Iwats.
  • Gonocormus teysmannii (Bosch) Bosch
  • Trichomanes bonincola Nakai
  • Trichomanes diffusum Blume
  • Trichomanes matthewii Christ
  • Trichomanes minutum Blume
  • Trichomanes palmatum C. Presl
  • Trichomanes proliferum Blume ex Hook.
  • Trichomanes proliferum Blume
  • Trichomanes saxifragoides C. Presl
  • Trichomanes subpinnatifidum Bosch
  • Trichomanes subtrifidum Mett. ex Christ
  • Trichomanes teysmannii Bosch

Description
C. minutum growing in Japan

Crepidomanes minutum is a small fern which grows epipetricly or epiphytically.[3][4]. It tends to grow in moist, low elevation forests where moisture is abundant and can tolerate deep shade.[5] It has long-creeping rhizomes from which its leaves arise. The rhizome does not have roots but instead has rhizoids. Its leaves range from 1.5cm long to 6cm, and are flabellate to 1-4 times pinnate but may also be palmately lobed in some individuals.[6][3] Leaves also have buds which allow individual leaves to proliferate and branch. It looks much like a moss and may be confused as one without careful examination.

The sori are located in involvucures at the tips of the lobes of the leaves and are somewhat cup-shaped.[5] It can also reproduce apogamously like many other ferns.

Taxonomy

The species was first described as Trichomanes minutum by Carl Ludwig Blume in 1828[7] but has since been moved to Crepidomanes minutum based on genetic evidence.[4] C. minutum has great variation in morphology between different populations, thus has extensive synonymy as many of these populations were described as separate species.[6] Further research, however, has revealed that the variation within the species is continuous and all variation is best regarded as intraspecific rather than interspecific variation.

Crepidomanes minutum may be diploid, triploid, or tetrapoid.[8] It has a very complex evolutionary history consisting of multiple sub-lineages which have been observed to interbreed.[8] The relationships of individual populations of C. minutum are best described by reticulate evolution.

Range

Crepidomanes minutum has a broad distribution throughout the Pacific in areas including but not limited to Australia, Bhutan, Cambodia, China, Equatorial Guinea, Hawaii, India, Indonesia, Japan, Java, Korea, Malaysia, Melanesia, Micronesia, Nepal, Philippines, Polynesia, Russia, Sri Lanka, Taiwan, Thailand, and Vietnam.[3] [5][8]

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References
  1. "Crepidomanes minutum". Tropicos. Missouri Botanical Gardens – via The Plant List.
  2. "ITIS Standard Report Page: Crepidomanes minutum". www.itis.gov. Retrieved 9 August 2020.
  3. Palmer, Daniel D. (2002). Hawai'i's ferns and fern allies. Honolulu: University of Hawai'i Press. ISBN 0-8248-2522-5.
  4. Ebihara, Atsushi; Dubuisson, Jean-Yves; Iwatsuki, Kunio; Hennequin, Sabine; Ito, Motomi (27 July 2006). "A Taxonomic Revision of Hymenophyllaceae". Blumea - Biodiversity, Evolution and Biogeography of Plants. 51 (2): 221–280. doi:10.3767/000651906X622210. Retrieved 9 August 2020.
  5. "Crepidomanes minutum". Flora of China – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  6. Reiko, Yoroi; Kunio, Iwatsuki (1977). "An observation on the variation of Trichomanes minutum and allied species". Phytotaxonomica et Geobotanica. 28 (4–6): 152–159.
  7. Blume, Carl (1828). Enumeratio Plantarum Javae. Lugduni Batavorum,Apud J.W. van Leeuwen. Retrieved 9 August 2020.
  8. Nitta, Joel H.; Ebihara, Atsushi; Ito, Motomi (November 2011). "Reticulate evolution in the Crepidomanes minutum species complex (Hymenophyllaceae)". American Journal of Botany. 98 (11): 1782–1800. doi:10.3732/ajb.1000484. Retrieved 9 August 2020.
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