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Exploring the Fascinating World of Ptychomitrium drouhardii Thér. Moss
Mosses are some of the most ancient and resilient plants on Earth. Among the diverse array of moss species, one particularly interesting variety is Ptychomitrium drouhardii Thér., a member of the Ptychomitriaceae family. In this blog post, we’ll take a closer look at this fascinating moss and explore its unique characteristics.
ptychomitrium_polyphyllum_rui_cunha.jpg from: https://www.iucn.org/news/europe/201605/our-red-list-species-assessors-exploring-world-bryophytes-manuela-sim-sim
Background on Ptychomitrium Mosses
The genus Ptychomitrium, commonly known as the Ptychomitrium mosses, belongs to the Bryophyta division and Bryopsida class. There are over 80 recognized Ptychomitrium species worldwide. These mosses are characterized by their small size, dark green coloration, and distinct capsule shape.
ptychomitrium_aust535_plt18-800.jpg from: https://www.nzplants.auckland.ac.nz/en/about/mosses/native-species/ptychomitriaceae/ptychomitrium-australe.html
Morphology and Identification of P. drouhardii
Ptychomitrium drouhardii Thér. is a small acrocarpous moss, typically growing in compact tufts or cushions. The leaves are lanceolate in shape and have a strong midrib. A key identifying feature is the plicate (pleated or folded) leaf surface. The leaf margins are usually recurved and the leaf tips are acute.
The sporophytes of P. drouhardii are also diagnostic. The seta (stalk) is short and the capsules are ovoid to ellipsoid in shape. The peristome teeth are divided and have a very distinct ornamentation pattern.
Global Distribution and Habitat
P. drouhardii has a wide global distribution, being found in many parts of Europe, Asia, Africa, and the Americas. It grows on exposed siliceous rock surfaces like boulders, cliffs, and rocky outcrops. This moss prefers dry, sunny habitats and can tolerate prolonged periods of desiccation.
Ecological Roles and Adaptations
Like other mosses, P. drouhardii plays important ecological roles. It helps with soil formation, nutrient cycling, water retention, and provides microhabitats for various invertebrates.
This moss has several adaptations to survive harsh, dry conditions:
- Poikilohydry – can tolerate desiccation
- Rhizoids – anchor moss and absorb water/nutrients
- Lamellae – increase surface area for CO2 uptake
- Papillose leaf cells – refract light to avoid overheating
| Characteristic | Description |
|---|---|
| Genus | Ptychomitrium |
| Species | P. drouhardii Thér. |
| Family | Ptychomitriaceae |
| Division | Bryophyta |
| Class | Bryopsida |
| Growth Form | Acrocarpous |
| Leaf Shape | Lanceolate |
| Leaf Surface | Plicate |
| Capsule Shape | Ovoid to ellipsoid |
| Habitat | Exposed siliceous rock |
Conclusion
Ptychomitrium drouhardii Thér. is a prime example of how mosses have evolved to thrive in challenging environments. Its unique morphology, wide distribution, and ecological importance make it a captivating subject of study for bryologists and nature enthusiasts alike.
The next time you’re out hiking and spot some dark green moss cushions clinging to a boulder, take a closer look – it might just be the remarkable Ptychomitrium drouhardii! What other secrets of the bryophyte world are waiting to be uncovered?