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(Asplenium myriophyllum)

Asplenium verecundum in habitat, Miami-Dade County. Photo Credit: J. Possley
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Aspleniaceae
  • State: FL
  • Nature Serve ID: 129842
  • Date Inducted in National Collection: 12/07/2021

A perennial lacy spleenwort with tufted fronds and an erect, unbranched stem with fibrous roots. Fronds are a bright green color, about 4dm in length, and can be ascending, arching, curving or dropping; sterile and fertile fronds are similar in appearance. Its petioles are short at just 0.5-5 cm in length and can appear brown, purple, or grayish brown in color.  Rachis is a dull purplish brown, to blackish or greenish, grooved and without hairs. The blades are bi- or tripinnate, 3 to 10 cm in length, up to about 5 cm wide,  lanceolate in overall shape, tapering toward both the base and apex, but narrower at the apex. Pinnae are borne in 18-22 alternate and well spaced pairs, ovate in outline, longer ones to about 3cm long and 1cm wide; pinnules are divided into up to 5 oblanceolate segments, with each segment growing up to 3mm long and 2mm wide. Elliptic in shape, the sori are borne one pinnule per segment (Nelson 2000).

Participating Institutions
  • 01/15/2018

Invasive species which threaten A. verecundum include Syngonium podophyllum, Epipremnum pinnatum, Thelypteris opulenta, Nephrolepis cordifolia, Nephrolepis brownii, Dioscorea bulbifera, and others.

  • 01/10/2018

The continued monitoring of wild populations on a biannual basis for mortality, recruitment, and  phenology is important; the exploration of genetic population variables for both wild and introduced populations should also be conducted.

  • 01/10/2018

Long-term studies of outplantings must be conducted to ensure that they are successful in all aspects of population ecology, including survival, reproduction, growth, and fitness. Appropriate areas to outplant are difficult to identify and it should be given great consideration as to the risk to natural populations of creating a new population or augmenting an existing population.

Nature Serve Biotics
  • 05/02/2017

Florida endemic. Extremely limited current range and very specialized habitat requirements.


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Taxon Asplenium myriophyllum
Authority (Sw.) C. Presl
Family Aspleniaceae
CPC Number 44682
ITIS 17352
Common Names Delicate Spleenwort | Modest Spleenwort | limestone spleenwort
Associated Scientific Names Asplenium myriophyllum | Asplenium verecundum | Asplenium subtile | Asplenium scalifolium
Distribution Currently, Asplenium verecundum is endemic to Miami-Dade county, as well as a handful of out counties in North Florida.  They are also present in Cuba, but the conservation status of these populations is not well known.

This species is held in a few Miami-Dade sites (6 protected and 1 unprotected). The number of remaining wild individuals in Miami is less than 1000 sporophytes and annual variation can be significant.
State Rank
State State Rank
Florida S1

Rockland hammock solution holes and sheltered limestone outcroppings in closed canopy, high humidity forest interior.

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID

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