Bryum Arcticum: The Enduring Moss of the Arctic

Bryum arcticum subsp. micans: A Fascinating Arctic Moss

Introduction

The world of mosses is full of fascinating species that play important ecological roles. One such moss is Bryum arcticum subsp. micans J.J.Amann, a member of the Bryaceae family. Also known simply as Bryum, this tiny but mighty plant thrives in the harsh conditions of the Arctic. In this blog post, we’ll take a closer look at this intriguing moss species.

Background

Bryum arcticum subsp. micans is a moss species first described by Swiss botanist

Jules Amann in 1918. It belongs to the Bryaceae family in the class Bryopsida

and phylum Bryophyta. This moss is found in Arctic and alpine regions of the Northern Hemisphere.

Morphology and Identification

B. arcticum subsp. micans forms small, compact cushions or turfs. The leaves are ovate-lanceolate, have a shiny appearance, and are arranged in a rosette at the stem tips. The seta (stalk bearing the capsule) is 1-3 cm long and the capsules are pendulous,

2-4 mm long

, with a well-developed peristome. Spores are

8-12 μm in diameter.

Global Distribution and Habitat

This Arctic moss is found in northern regions of Europe, Asia, and North America, typically growing on damp soil, rocks, and cliff ledges in tundra and alpine habitats. It is well-adapted to the cold, with the ability to survive under snow cover for much of the year.

Ecological Roles and Adaptations

Like other mosses, B. arcticum subsp. micans plays a vital role in its ecosystem:

• Helps retain moisture and prevent soil erosion
• Provides shelter and habitat for microorganisms and small invertebrates
• Pioneers the colonization of bare ground, paving the way for other plants
• Survives harsh Arctic conditions through adaptations like desiccation tolerance and freeze resistance

Conclusion

Bryum arcticum subsp. micans J.J.Amann may be small, but it is a remarkable moss that thrives in the challenging conditions of the Arctic. Its unique adaptations and important ecological roles make it a fascinating subject of study for botanists and enthusiasts alike. Next time you find yourself in the tundra, keep an eye out for this shiny little moss! What other secrets might it hold?