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jelly lichen

Scientific Name: Collema callopismum

Family: Collemataceae

Category: Lichen

Growth: Lichenous

Duration:

Other Names:

       

River Jelly Lichen (Collema dichotomum)

The River Jelly Lichen, scientifically known as Collema dichotomum, is a fascinating example of a lichen that thrives in aquatic environments. Its unique characteristics and ecological role make it a subject of interest for botanists and nature enthusiasts alike.

Considerations for Pets

  • The thallus of the River Jelly Lichen is gelatinous when wet.

Taxonomy and Nomenclature

  • Scientific Name: Collema dichotomum (With.) Coppins & Laundon
  • Common Name: River Jelly Lichen
  • Family: Collemataceae
  • Order: Lecanorales
  • Synonyms: The text mentions Collema ohioense in reference to COLLEMA CONGLOMERATUM, which is a Dotted Jelly Lichen.

Distribution and Habitat

  • This aquatic lichen grows on submerged rocks and boulders in fast-flowing rivers.
  • It has been found in the upper reaches of rivers in Northumberland and Wales.

Morphological Characteristics and Growth Habits

  • The thallus (lichen body) forms flattened or erect, bright to dark green rosettes.
  • The lobes are convex, finger-like, and one to two centimeters long.
  • When wet, the thallus becomes gelatinous.
  • The text also refers to leafy (foliose) jelly lichens found growing on the bark of trees.

Ecological Role

  • The River Jelly Lichen's well-being needs consideration with regard to canoe access, ensuring the activities do not adversely affect salmonid populations.
  • Safeguarding measures against developments like outdoor river pursuits are important to avoid compromising conservation.

Associations

  • The photobiont (the photosynthetic partner) of this lichen is the cyanobacterium genus Nostoc.

Quirky Facts

  • Collema dichotomum looks more like a seaweed than a lichen.
  • Some jelly lichens absorb water until they are jelly-like. One such lichen has the English name "bat's wings."

Further Information

  • Encyclopedia of Life: Search for articles about Collema dichotomum.
  • ARKive: Explore photos and facts about the River Jelly Lichen.
  • APHOTOFUNGI and APHOTOMARINE Photographic Stock Libraries: Provide photographic resources for various Jelly Lichen species.