Hydropunctaria amphibia

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Hydropunctaria amphibia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Eurotiomycetes
Order: Verrucariales
Family: Verrucariaceae
Genus: Hydropunctaria
Species:
H. amphibia
Binomial name
Hydropunctaria amphibia
(
Cl.Roux
(2011)
Synonyms[1]
  • Verrucaria amphibia Clemente (1807)

Hydropunctaria amphibia is a species of

Gwaii Haanas's upper littoral fringe. The black, crust-like thallus grows on seashore rocks – both siliceous rocks and limestone – in the lower supralittoral zone, an area also known as the splash zone. Originally described more than two centuries ago as a species of Verrucaria, Hydropunctaria amphibia sets itself apart from other species in Hydropunctaria through the distinct shape of the perithecium
(fruiting body) apex, which is either flat-topped or scalloped, in contrast to the typically rounded or immersed apex seen in its relatives.

Taxonomy

The lichen was originally described in 1807 by the Spanish botanist Simón de Roxas Clemente y Rubio, who classified it as a species of Verrucaria. His Latin description of the organism was brief: Crusta subtartarea suborbiculari uniformi contigua aequabili picea nitida, tuberculis subcylindricis tandem subpatellulaeformibus ('The crust is almost tartarean, suborbicular, uniform, contiguous, even, pitch-black, shiny, with tubercles initially subcylindrical then eventually somewhat in the form of a small patella (kneecap)').[3][note 1] In 2011, Claude Roux reclassified the taxon to Hydropunctaria,[4] a genus previously branched out from Verrucaria in 2009 to form its own distinct group.[5] Alan Orange, apparently unaware of this transfer, proposed a similar transfer himself the following year.[6]

Description

The crustose lichen Hydropunctaria amphibia is characterised by a prothallus that is typically inconspicuous, but in some specific, small areas, it can become visible as a whitish layer. The thallus, which is on the surface of the rock,[7] presents a translucent green to amber colouration when wet, and black when dry.[8] It has an abundantly cracked surface that often separates into discrete areoles (small, distinct patches), making the surface appear uneven with numerous blackish ridges. The actively growing edge of the thallus is clearly defined, with ridges measuring between 40 and 400 micrometres (μm) in length and 40 to 50 μm in width, generally aligned perpendicular to the margin. Within the interior of the thallus, these ridges are shorter, often branched, and do not follow a uniform direction.[7]

Hydropunctaria amphibia growing on aerohaline (sea-sprayed) rocks.

The pseudocortex, a layer beneath the surface of the thallus, contains brown pigment, contributing to the lichen's dark appearance. Perithecia, the reproductive structures of the lichen, project from the thallus surface. They typically measure 220 to 360 μm in diameter, and often have a distinct flat top. The sides may be uneven or have protrusions (bosses). The ostiole, or opening, of the perithecia may be visible as a small pit.[7]

The involucrellum, another structural component of the perithecia, is well-developed, providing additional protection to the spore-producing parts. The ascospores, which are the reproductive cells produced within the perithecia, are narrowly cylindrical to ellipsoidal in shape, measuring between 13 and 19.5 μm in length and 5 to 7.5 μm in width, with a length to width ratio ranging from 2.1 to 3.5, indicating their elongated form.[7]

The

red algal genus Hildenbrandia.[9]

Similar species

Hydropunctaria amphibia can be distinguished from other species within the genus Hydropunctaria by several characteristics. One of the key differences is the structure of the perithecium, which in Hydropunctaria amphibia is either flat-topped or crenulate (having a scalloped or notched edge), as opposed to the more commonly rounded or immersed apex found in other Hydropunctaria species. Furthermore, Hydropunctaria amphibia has a more extensive development of densely pigmented tissue throughout its thallus. This pigmentation manifests as elongated bars, up to 60 μm wide, that reach the surface of the thallus. These pigmented areas are particularly noticeable near the thallus margin, where they align perpendicularly to the margin and parallel to the elongated cracks that characterise the species.[7]

One study suggested that a feasible way to distinguish between H. amphibia and H. maura was the thickness of the thallus edge and the width of the ascospores.[10] A later publication, however, found that these characters overlapped in the studied population, and that it was more reliable to use the shape of the perithecia, the extent of thallus cover over the perithecia, and the shape of the carbonaceous thickenings.[11] Another source suggests that when wet, H. amphibia becomes more light coloured and translucent compared to H. maura, and so its ridges become more distinctly contrasted.[8]

In comparison, Wahlenbergiella striatula, another marine lichen species that may present ridges on its thallus, differs primarily in the size of its ascospores, which are smaller than those of Hydropunctaria amphibia.[7] Also, its thallus has a dot matrix that imparts texture to the surface.[12]

Habitat and distribution

Hydropunctaria amphibia is one of several marine lichens in the genus Hydropunctaria.

high tide line that is regularly but infrequently splashed. It typically gets exposure to direct sunlight in these locations.[15] It is one of few species able to survive under these conditions, due to its extreme resistance to desiccation. Other organisms commonly found in this habitat include the barnacle species Microeuraphia depressa, and the sea snail species Melarhaphe neritoides and Echinolittorina punctata.[16] Hydropunctaria amphibia grows in the belt underneath its close relative H. maura.[11]

The lichen is widely distributed in Europe, from Norway south to the

Gwaii Hanaas, it grows in the upper littoral fringe (defined as 0.3–0.8 m (1 ft 0 in – 2 ft 7 in) above the Fucus barnacle zone), most commonly on limestone.[21]

Notes

  1. ^ Passage translated by GPT-4.

References

  1. Species Fungorum
    . Retrieved 7 February 2024.
  2. ^ "Hydropunctaria amphibia (Clemente) Cl. Roux". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 7 February 2024.
  3. ^ Clemente y Rubio, S.R. (1807). Ensayo sobre las variedades de la vid comun que vegetan en Andalucia [Essay on the varieties of the common grapevine that grow in Andalusia] (PDF) (in Latin). Madrid: Imprenta de Villalpando. p. 299.
  4. ^ Roux, C.; Masson, D.; Bricaud, O.; Coste, C.; Poumarat, S. (2011). "Flore et végétation des lichens et champignons lichénicoles de quatre réserves naturelles des Pyrénées-Orientales (France)" [Flora and vegetation of lichens and lichenicolous fungi from four nature reserves in the Pyrénées-Orientales (France)] (PDF). Bulletin de la Société Linnéenne de Provence (in French). 14 (spécial): 3–151 [108].
  5. doi:10.1002/tax.581019
    .
  6. doi:10.1017/S0024282911000867
    .
  7. ^ a b c d e f g Orange, A.; Cannon, P.; Prieto, M.; Coppins, B.; Sanderson, N.; Simkin, J. (2023). Verrucariales: Verrucariaceae, including the genera Agonimia, Atla, Bagliettoa, Catapyrenium, Dermatocarpon, Endocarpon, Henrica, Heteroplacidium, Hydropunctaria, Involucropyrenium, Merismatium, Nesothele, Normandina, Parabagliettoa, Placidopsis, Placidium, Placopyrenium, Polyblastia, Psoroglaena, Sporodictyon, Staurothele, Thelidium, Trimmatothele, Verrucaria, Verrucula, Verruculopsis and Wahlenbergiella (PDF). Revisions of British and Irish Lichens. Vol. 31. p. 35.
  8. ^ a b Taylor, Ronald M. (1982). Marine Flora and Fauna of the Northeastern United States. Lichens (Ascomycetes) of the Intertidal Region (Report). NOAA Technical Report NMFS Circular. Vol. 446. U.S. Department of Commerce. National Oceanic and Atmospheric Administration. National Marine Fisheries Service. p. 17.
  9. doi:10.1017/s0024282973000459
    .
  10. ^ Renobales Scheifler, Gustavo; Noya, Rosario (1991). "Estudio morfológico comparado de Verrucaria maura y V. amphibia en la Costa Vasca" [Comparative morphological study of Verrucaria maura and V. amphibia on the Basque Coast]. Acta Botanica Malacitana. 16: 149–156.
  11. ^
    doi:10.1127/0029-5035/2005/0080-0073
    .
  12. PMID 36847971
    .
  13. doi:10.1007/s13225-015-0339-4
    .
  14. doi:10.1006/lich.2001.0344
    .
  15. hdl:10261/224522
    .
  16. hdl:10045/48363
    .
  17. hdl:10045/48365
    .
  18. doi:10.1656/045.028.0306
    .
  19. ^ Brodo, Irwin (1995). "Lichens and lichenicolous fungi of the Queen Charlotte Islands, British Columbia, Canada. 1. Introduction and new records for B.C., Canada and North America". Mycotaxon. 56: 163.
  20. doi:10.3119/20-10
    .
  21. doi:10.22621/cfn.v118i3.11
    .
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