a-Entodontopsis-anceps-b-Hyophila-involuta-c-Trachyphyllum-inflexum-d-Vesicularia.jpg

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Meiothecium mediopapillatum J.Froehl.: A Fascinating Moss of the Sematophyllaceae Family

Introduction

Mosses are often overlooked, but they play crucial roles in ecosystems around the world. One particularly interesting moss is Meiothecium mediopapillatum J.Froehl., also known simply as Meiothecium. This small but mighty moss is part of the Sematophyllaceae family and has some unique characteristics. Let’s dive in and learn more about this fascinating bryophyte!

Background

Meiothecium mediopapillatum J.Froehl. is a species of moss first described by German botanist Johann Baptist Georg Wolfgang Fresenius in 1845. It is classified under:

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9.1.jpg from: https://ilovenonvascplants.blogspot.com/2015/10/specimen-9.html

  • Kingdom: Plantae
  • Phylum: Bryophyta
  • Class: Bryopsida
  • Order: Hypnales
  • Family: Sematophyllaceae

The Sematophyllaceae family contains over 50 genera and 1000 species of mosses found in tropical and subtropical regions worldwide.

Morphology and Identification

Meiothecium mediopapillatum is a small, delicate moss that forms dense mats. Its stems are creeping and irregularly branched, typically reaching 1-2 cm long. The leaves are ovate-lanceolate, 0.5-1.5 mm long, and have a short, double costa (midrib). A key identifying feature is the presence of papillae (small protuberances) on the leaf cells, especially in the middle of the leaf (hence the species name mediopapillatum).
The moss is autoicous, meaning both male and female reproductive structures are found on the same plant. Sporophytes are common, with the seta

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B4000034-Light_micrograph_of_cells_in_a_moss_leaf.jpg from: https://www.sciencephoto.com/media/16735/view

(stalk) 5-15 mm long and the capsule ovoid to cylindrical and inclined to horizontal.

Global Distribution and Habitat

Meiothecium mediopapillatum has a wide distribution in tropical and subtropical regions of the Americas, Africa, and Asia. It grows on various substrates, including tree bark, decaying wood, rocks, and soil, often in moist, shaded habitats such as rainforests and cloud forests. The moss is found from lowland to montane elevations.

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moss-diagram.jpg from: https://researchguides.library.vanderbilt.edu/c.php?g=156859&p=1390570

Ecological Roles and Adaptations

Like other mosses, Meiothecium plays important ecological roles:

  • Moisture retention: The dense mats help retain moisture in the ecosystem.
  • Nutrient cycling: It aids in breaking down organic matter and cycling nutrients.
  • Microhabitats: The moss provides shelter and habitat for small invertebrates.
  • Bioindicator: Meiothecium is sensitive to air pollution and can be used to monitor air quality.

The papillae on the leaf cells are thought to be an adaptation to help the moss absorb and retain water in its habitat.

Figura-24-Meiothecium-boryanum-a-Aspecto-geral-do-gametofi-to-b-c-Filidios-d.png

Figura-24-Meiothecium-boryanum-a-Aspecto-geral-do-gametofi-to-b-c-Filidios-d.png from: https://www.researchgate.net/figure/Figura-24-Meiothecium-boryanum-a-Aspecto-geral-do-gametofi-to-b-c-Filidios-d_fig20_262468133

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39-Figure17-1.png from: https://www.semanticscholar.org/paper/The-family-Sematophyllaceae-(Bryopsida)-in-Part-2.-Schofield-Ramsay/6e2613a7e066bc0d295ff5aa59e38485f71ff2bd/figure/7

Visualisation-of-intact-extraradical-networks-produced-by-the-AM-fungal-species-Glomus_Q640.jpg

Visualisation-of-intact-extraradical-networks-produced-by-the-AM-fungal-species-Glomus_Q640.jpg from: https://www.researchgate.net/figure/Visualization-under-the-dissecting-microscope-40x-of-Glomus-mosseae-extraradical-hyphae_fig3_26287412

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moss_pseudoscleropodium_purum_2016.03.03_b.jpg from: http://moremoth.blogspot.com/2016/03/wood-ground-mosses.html

Characteristic Description
Stem Creeping, irregularly branched, 1-2 cm long
Leaves Ovate-lanceolate, 0.5-1.5 mm long, short double costa
Leaf cells Papillose, especially in middle of leaf
Sporophyte Seta 5-15 mm long, capsule ovoid to cylindrical, inclined to horizontal
Habitat Tree bark, decaying wood, rocks, soil; moist, shaded areas
Distribution Tropical and subtropical Americas, Africa, Asia

Conclusion

Meiothecium mediopapillatum J.Froehl. may be small, but it is a remarkable moss with a wide distribution and important ecological roles. Its unique papillose leaf cells and autoicous reproductive strategy help it thrive in tropical and subtropical habitats. Next time you’re in a rainforest, take a closer look – you might just spot this fascinating Sematophyllaceae species! What other amazing bryophytes have you encountered in your adventures?

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redbyrum2.jpg from: https://powellriverbooks.blogspot.com/2015/11/coastal-bc-plants-glossy-red-bryum-moss.html

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81J92O7pObL._AC_SL1203_.jpg from: https://www.amazon.com/CLISPEED-Lifelike-Artificial-Preserved-Centerpieces/dp/B0B53J5NZC