Mastocarpus papillatus

Mastocarpus papillatus, sometimes called Turkish washcloth, black tar spot,[4] or grapestone[5] is a species of red algae in the family Phyllophoraceae. It is sometimes confused with the distantly related Turkish towel (Chondracanthus exasperatus) which is of a similar texture but larger. The specific epithet papillatus ('with papillae')[6] is due to the nipple-like projections on the female gametophyte which can give the texture of a terrycloth washcloth found at a Turkish bath.[4]

For the species of seaweed called 'Turkish towel', see Chondracanthus exasperatus. For the fungus called 'tar spot', see Rhytisma acerinum.

Mastocarpus papillatus
Turkish washcloth
Scientific classification
(unranked): Archaeplastida
Division: Rhodophyta
Class: Florideophyceae
Order: Gigartinales
Family: Phyllophoraceae
Genus: Mastocarpus
Species:
M. papillatus
Binomial name
Mastocarpus papillatus
Synonyms[2][3]

Distribution

Despite the common name, it grows nowhere near Turkey. It is instead native to the northeastern Pacific Ocean and commonly can be found in California, Oregon, Washington, British Columbia, and Alaska.[7][8] It has been found growing as far north as the Commander Islands[9] and the Russian Far East,[10] and as far south as Chile.[11][12][13]

Habitat

It grows on rocky substrates in the high- to mid-intertidal zones and has been found growing at depths of 250 m.[4] Like many red algae species, it uses phycoerythrin to photosynthesize which allows it to grow deeper than plants using other pigments.[4]

Description

Turkish washcloth is reddish-brown to almost black, with males paler than females and lacking the signature papillae on the blades.[4] The blades are branched and small at less than 15 cm long, as one would expect to a plant with a diminutive common name.[4] The first blades in the spring are thin, purple and lack papillae.[5] Later in the year the thalli dry out and become grey and lifeless.[5]

Mastocarpus jardinii is a similar species, and can be confused with M. papillatus.[14] Mazzaella affinis thalli looks similar in shape and color to male M. papillatus, but are smaller and grow in thick mats and not as individuals.[14] It also can be confused with other species with Petrocelis phases , such as Pikea, other Mastocarpus spp., Ralfisa, and Hildenbrandia, thought the last two are thinner than the Turkish towel crust.[14]

Life cycle

M. papillatus has a relatively complex reproductive cycle. Male gametophytes discharge nonflagellated sperm to drift in the current until they attach to the trichogynes of female plants. There the sperm perform mitosis without cell division, turning into a spermatium. Fertilisation then proceeds through a fertilization pore between the trichogyne and the spermatium. The eggs then grow into tetrasporophytes which are more or less copies of their parents.[4]

Alternately, the tetrasporophyte goes through the Petrocelis phase (so named as it was thought to be a distinct genus, Petrocelis, of Phyllophoraceae) and grows into a crust that looks like spilled tar, inspiring the black tar spot common name. The tetrasporophyte undergoes meiosis and produce tetrasporangia which release spores to germinate elsewhere. Eventually the crust grows into a typical adult plant.[4] This crustose phase is shared by all members of the genus Mastocarpus as well as those in Pikea.[14]

Ecology

Turkish washcloth is food for many animals, including Echinolittorina ziczac, Littorina, Amphipoda, Lottia, Pholis crassispina, Lottia scutum, Trochidae, Lacuna vincta, Stenosoma, Mopalia swanii, and Cryptochiton stelleri.[15]

Like the Porphyra species used to make nori, M. papillatus is susceptible to infection by the parasitic oomycete Pythium porphyrae, or red rot disease, which can kill large colonies.[4] It is also susceptible to infection by Pythium marinum.[16]

Uses

Grapestone is edible[4] and can be cooked in soups or stir-fries but care must be taken as overcooking can turn the plant mushy and gelatinous.[5] This property can be exploited to use it as a thickening agent like its close relative Mastocarpus stellatus.[5] Grapestone has a similar flavor to oysters.[17]

Grapestone is easily foraged from the shore, but like any wild species overharvesting is possible. By grabbing the longer blades and pulling sideways, the shorter blades and holdfast may remain on the rock and live on.[5]

M. papillatus is also thought to have antimicrobial properties.[4]

References
  1. Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.
  2. M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org/search/species/detail/?species_id=ra408038afa540140; searched on 11 September 2017
  3. Guiry, Michael D. (2015). Mastocarpus papillatus (C.Agardh) Kützing, 1843. In: Guiry, M.D. & Guiry, G.M. (2017). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=163258 on 2017-09-11
  4. "Turkish Washcloth or Black Tar Spot". Slater Museum of Natural History. Slater Museum of Natural History. Marine Panel. Tacoma, WA: University of Puget Sound. 2017. Retrieved 12 September 2017.
  5. Lewallen, Eleanor; Lewallen, John (21 March 1996). Sea Vegetable Gourmet Cookbook and Wildcrafter's Guide (1st ed.). Mendocino, CA: Mendocino Sea vegetable Company. pp. 41, 84. ISBN 978-0964764378. LCCN 95-78957. OCLC 34314822.
  6. G., Chuck (2005). "Dictionary of Botanical Epithets". Dictionary of Botanical Epithets. Retrieved 11 September 2017. papillosus papillosa papillosum with papillae papilla papill noun/f a nipple, teat
  7. "Turkish Washcloth (Mastocarpus papillatus)". iNaturalist.org. iNaturalist Network. Retrieved 11 September 2017.
  8. "Mastocarpus papillatus Taxonomy Browser BOLDSYSTEMS". Barcode of Life Data Systems (BOLD). 2014–2017. Retrieved 11 September 2017.
  9. Selivanova, O.N. & Zhigadlova, G.G. (2013). Marine benthic algae of the Commander Islands (Pacific Coast of Russia) with checklist Revised in 2012. ISRN Oceanography 2013: 1-12. https://dx.doi.org/10.5402/2013/470185
  10. Perestenko, L.P. (1996 '1994'). Krasnye vodorosli dal'nevostochnykh more Rossii [Red algae of the far-eastern seas of Russia]. pp. 1-330[331], 60 pls. St. Petersburg: Rossiiskaia Akademiia Nauk, Botanichesk Institut im. V.L. Komarova [Komarov Botanical Institute, Russian Academy of Sciences] & OLGA, a private publishing company.
  11. Santelices, B. (1989). Algas marinas de Chile. Distribución, ecología utilización y diversidad. pp. 399. Santiago: Ediciones Universidad Católica de Chile.
  12. Ramírez, M.E. & Santelices, B. (1991). Catálogo de las algas marinas bentónicas de la costa temperada del Pacífico de Sudamérica. Monografías Biológicas 5: 1-437.
  13. Hoffmann, A. & Santelices, B. (1997). Flora marina de Chile Central. Marine flora of central Chile. pp. 434. Santiago: Ediciones Universidad Católica de Chile.
  14. "Mastocarpus". MARINe. Pacific Rocky Intertidal Monitoring. Santa Cruz, CA: UC Santa Cruz. August 18, 2017. Retrieved 16 September 2017.
  15. Wood, SA; Russell, R; Hanson, D; Williams, RJ; Dunne, JA (August 18, 2015). "Effects of spatial scale of sampling on food web structure". Ecology and Evolution. 5 (17): 3769–3782. doi:10.1002/ece3.1640. PMC 4567879. PMID 26380704.
  16. Kerwin, James L.; Johnson, Lisa M.; Whisler, Howard C.; Tuininga, Amy R. (1 May 1992). "Infection and morphogenesis of Pythium marinum in species of Porphyra and other red algae". Canadian Journal of Botany. 70 (5): 1017–1024. doi:10.1139/b92-126. ISSN 0008-4026. OCLC 5140406448.
  17. Hillinger, Charles (December 25, 1989). "Harvest of the Ocean Garden : Agriculture: Picturesque Northern California coastal waters provide some atypical farmers with an almost limitless bounty: seaweed". Business. Los Angeles Times. Los Angeles, CA: Los Angeles Times. Retrieved 16 September 2017. grapestone, a seaweed with an oyster-like taste and covered with crunchy bumps
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