Cladonia perforata is a rare species of lichen known by the common names Florida perforate cladonia and Florida perforate reindeer lichen. It is endemic to the state of Florida in the United States, where it is known from 16 populations in four widely separated areas of the state . It is native to a very specific type of Florida scrub habitat which is increasingly rare and patchy due to habitat destruction, degradation, and fragmentation . In 1993 this was the first species of lichen to be federally listed as an endangered species of the United States .
Population size - in the traditional sense - for Cladonia perforata is difficult to estimate. It consists of strictly asexual, branching structures which reproduce via vegetative fragmentation. Genetic studies have so far supported an asexual life history (pers. obs.). Effective population sizes are typically one or two genetic individuals per subpopulation. Therefore density and area occupied are probably better measures of abundance for this species than count data. Most subpopulations probably contain less than 0.1 km coverage of lichen, with a few containing only a few square meters. The degree of fragmentation is naturally high, since appropriate habitat (open Florida scrub) is naturally patchy and disjunct. Most locations are separated by many kilometers of intervening unsuitable habitats and even locations supporting several subpopulations in close proximity still have what are probably very effective barriers to dispersal among them.
Regularity: Regularly occurring
Global Range: Florida endemic: restricted to small areas in northwest and central Florida, with one occurrence in southeast Florida.
A Cladonia with perforate podetia. The podetia usually exceed 2 mm in diameter, while those of related C. unciales are much narrower. No other Cladonia in the U.S. has broad, stout, perforate podetia. C. perforata is very loosely to not at all attached to substrate. Thallus is very brittle when dry, leathery when wet.
Catalog Number: US
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): G. Llano
Year Collected: 1945
Locality: Santa Rosa Island, Eglin Field., Escambia, Florida, United States, North America
- Holotype: Evans, A. W. 1952. Trans. Connecticut Acad. Arts. 38: 326.
Habitat and Ecology
Comments: Sandy openings in stablized sand dunes with Florida scrub vegetation. Often associated with Ceratiola.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 6 - 20
Comments: Florida endemic, known from about 12 sites total: 6 on Archbold Biological Station, 2 on Santa Rosa Island in northwest Florida, 1 in Martin County in southeast Florida, and several others in Highlands County (Martin 1993, Buckley & Hendrickson 1988, Wilhelm & Burkhalter 1990, Milius, 2000).
Sprouter as asexual dispersal mechanism. Tolerates gentle natural motion of shifting sand, but cannot tolerate more severe disturbance or trampling.
Life History and Behavior
Persistence: PERENNIAL, EVERGREEN
"Pollen vector" applies to conidia dispersal. "Dispersal vector" applies to vegetative propagules. Spore dispersal method or existence currently unknown.
IUCN Red List Assessment
Red List Category
Red List Criteria
- Needs updating
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G1 - Critically Imperiled
Reasons: Florida endemic, known from about a dozen sites in three parts of the state, rare within restricted range, habitat threatened, species relatively fragile and intolerant of trampling or fire yet requiring disturbance-maintained habitats.
Date Listed: 04/27/1993
Lead Region: Southeast Region (Region 4)
Listing status: E
For most current information and documents related to the conservation status and management of Cladonia perforata, see its USFWS Species Profile
Global Short Term Trend: Decline of 10-30%
Comments: Habitat is being lost to development in most of this lichen's range.
Comments: Trampling, over-collection, fire, and succession. Already restricted habitat is under development pressure. Wind (esp. hurricanes) may carry fragments beyond boundaries of small sites, reducing species' ability to maintain itself. Species not able to disperse readily to new sites; colonization apparently only by fragmentation (Milius, 2000).
Conservation actions also include reintroduction efforts at Eglin Air Force Base, home to the largest subpopulation (East Pass) and the two extirpated sites at Pole 28 and A10. East Pass was used as a source population for these reintroductions and there is ongoing monitoring of hurricane impacts and reintroduced population success. Post-fire recovery is being monitored at several subpopulations on the Lake Wales Ridge. Fire management is a critical part of conservation of this and many other Florida scrub species and is ongoing throughout most protected sites along the Lake Wales Ridge and the Atlantic Coast Ridge.
Cladonia perforata is a rare species of lichen known by the common names Florida perforate cladonia and Florida perforate reindeer lichen. It is endemic to the state of Florida in the United States, where it is known from 16 populations in four widely separated areas of the state. It is native to a very specific type of Florida scrub habitat which is increasingly rare and patchy due to habitat destruction, degradation, and fragmentation. In 1993 this was the first species of lichen to be federally listed as an endangered species of the United States.
This lichen is relatively large, its yellow-gray, slightly glossy fruiting body measuring up to 6 centimeters (2.4 in) in length. The fruiting body, the visible part of the lichen, is a branching, tufted structure. The branches, or podetia, are lined with hyphae on their inner surfaces and are perforated with tiny holes. It and similar species undergo vegetative reproduction in which it clones by physically breaking up and spreading. No sexual reproduction has been observed. The lichen's method of biological dispersal is to have its fragments swept or blown to new locations.
In general, this species is poorly known. Little information is available about its life history, including its precise reproductive cycle, growth, population dynamics, or any seasonal changes it might experience.
Distribution and habitat
The habitat of this species is the white sand of the Florida scrub, already a rare and endangered type of ecosystem, and the lichen requires a specific spot within the habitat. It can be found on high dunes and ridges among sand pines (Pinus clausa) in the part of the scrub understory called "rosemary balds": land dominated by Florida rosemary (Ceratiola ericoides). The lichen occurs in very dry, open sites on sand with little plant cover around it. It can often be found tangled up in clumps with other species of lichen.
It is difficult to estimate the abundance of this species. Much of the current data is outdated. The organism in question is often small and sometimes hard to spot on the ground or in the leaf litter. Furthermore, what constitutes one individual organism is not always apparent; one living lichen may be several centimeters long or just a tiny fragment. Populations fluctuate often, occurrences are destroyed, and several new ones have been discovered and rediscovered in recent years. The species was first discovered in 1945 on Eglin Air Force Base property on Santa Rosa Island near Pensacola. This, the lichen's type locality, was later paved and the population presumably destroyed. A population was rediscovered in this area of the Florida Panhandle in 1989. The species has a disjunct distribution: the other populations are located on the east and west coasts of the main peninsula of Florida.
Threats to this species include development of its habitat for residential, agricultural, and commercial use, pollution and trash dumping, off-road vehicle use, trampling and crushing by people, animals, and vehicles, and severe storms and wildfires. Natural processes such as hurricanes and fires are necessary for maintaining habitat such as Florida scrub, but these events do kill the lichen by burning it, crushing it to small pieces, sweeping it away in storm surges, or burying it in sand. Hurricane Opal in 1995, for example, destroyed at least two known occurrences of the lichen. Lichen rescue operations are sometimes performed in the days after a hurricane in an effort to unbury individuals from sand and debris, and even pluck them out of trees where they have landed. Some individuals are collected on beds of sand and brought indoors when storms are expected. Even if the lichen itself is undamaged in a storm, parts of its rare, limited potential habitat may be rendered unsuitable by disturbances.
The lichen is also vulnerable because it is slow-growing, slow to recover after mortality, inefficient in its dispersal, and already rare with unstable populations. Its patchy, fragmented distribution makes it likely to experience isolation and extirpation of small populations. Since most populations are just clusters of clones, each population is extremely valuable in the conservation of the species. The populations occur in North, Central, and South Florida, and can be separated by hundreds of miles; gene flow between them is often highly unlikely.
New populations have been reintroduced to appropriate habitat where the species has been observed before. Many populations are located in areas that are protected from development and fragmentation. At last review the species was still considered endangered.
- USFWS. Cladonia perforata Five-year Review. 2007.
- Teague, D. and D. Ripley. A tale of two species. Endangered Species Bulletin. November, 2000.
- Milius, S. Yikes! The Lichens Went Flying - lichens as endangered species. Science News August 26, 2000.
- USFWS. Endangered or threatened status for seven Central Florida plants. Federal Register April 27, 1993.
- USFWS. Cladonia perforata Species Fact Sheet. Multispecies Recovery Plan for South Florida.
- Buckley, A. and T. O. Hendrickson. (1988). The distribution of Cladonia perforata Evans on the southern Lake Wales Ridge in Highlands County, Florida. The Bryologist 91(4): 354–356.
- Wilhelm, G. S. and J. R. Burkhalter. (1990). Cladonia perforata, the Northwest Florida population. The Bryologist 93(1): 66–68.
- Yahr, R. (2003). Cladonia perforata. 2006. IUCN Red List of Threatened Species. IUCN 2010. www.iucnredlist.org. Retrieved on 12 February 2011.
Names and Taxonomy
Comments: Generally regarded as a distinct species of lichen; recognized by Esslinger and Egan in their 1995 ABLS checklist, by the Florida Natural Areas Inventory Program, and by the U.S. Fish and Wildlife Service.
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