SafePlants

Andreaea: The Granite Mosses

The genus Andreaea, commonly referred to as andreaea moss or black rock-moss, comprises a fascinating group of mosses adapted to harsh environments. Often found on rocks, these mosses are sometimes called "granite-mosses."

Considerations for Pets

• The text mentions that some Andreaea species form dense tufts up to 2 cm high. This small size might make them easily disturbed by pets, especially those that dig or forage in gardens or natural areas.

Considerations for Children

• Similar to the consideration for pets, the small size and potential habitat of these mosses may pose a risk of disturbance if found in areas frequented by children.

Taxonomy and Nomenclature

• Scientific Name: Andreaea Hedw.
• Family: Andreaeaceae
• Class: Andreaeidae
• Andreaea is one of only two moss genera in the class Andreaeidae.
• Synonyms:
  • Andreaea petrophila Ehrh. (modern name: Andreaea rupestris)
• Examples of subordinate taxa:
  • Andreaea megistospora var. epapillosa (B. Murr.) Crum & Anderson
  • Andreaea megistospora var. megistospora B.M. Murray

Distribution and Habitat

• Andreaea frigida is endemic to Europe, specifically found in mountainous regions of Austria, the Czech Republic, and France.
• Other species are found in various locations, including:
  • China (with several species and one subspecies)
  • Antarctica
  • Scandinavia (e.g., Andreaea obovata in Sweden and Norway)
  • Scottish Highlands
• They often grow on the surface of rocks.

Morphological Characteristics and Growth Habits

• Plants are often blackish green to black, or reddish brown to dark brown.
• They typically form dense tufts.
• Stems can grow up to 3 cm, but are usually shorter.

Ecological Role

• In Antarctic environments, Andreaea regularis has been studied in relation to UV-B radiation and pigmentation.

Genetic and Cytological Information

• Spore size and morphology are crucial characteristics for identifying different Andreaea species.
• The pattern of sporophyte maturation is unique among mosses in this genus.

Quirky Facts

• Andreaea species are unique among mosses as they lack a seta (stalk supporting the capsule). The capsules protrude only slightly above the surrounding structures.

Interactions with Other Organisms

• The text suggests that temperatures within Andreaea regularis moss cushions have been studied in relation to their microclimate.

Further Information

• Integrated Taxonomic Information System (ITIS)
• NBN ID code: NBNSYS0100006103
• USDA map for Andreaea rupestris Hedw. var. acuminata sensu Sharp