SafePlants

Cladonia: The Cup Lichen

Cladonia, commonly referred to as cup lichen, is a fascinating genus of moss-like lichens belonging to the family Cladoniaceae. These lichens are a vital food source for reindeer and caribou, playing a crucial role in boreal ecosystems.

Considerations for Pets

• Some Cladonia species, like those with "pixie cup" formations, have small, cup-like structures (podetia) that could potentially be ingested by pets, especially smaller animals exploring terrariums or gardens.
• The text mentions the presence of soredia (farinose granules) on some species, which are powdery propagules that could be irritating if inhaled or contacted.

Considerations for Children

• The small, cup-like structures of some Cladonia species might be tempting for young children to pick and handle.
• The text mentions the presence of soredia (farinose granules) on some species, which are powdery propagules that could be irritating if inhaled or contacted.

Taxonomy and Nomenclature

• Scientific Name: Cladonia P. Browne
• Family: Cladoniaceae
• Common Names: Cup lichen, Pixie cup lichen
• Specific species mentioned: Cladonia asahinae (pixie cup lichen), Cladonia pyxidata, Cladonia borealis, Cladonia fimbriata, Cladonia chlorophaea, Cladonia coccifera, Cladonia monomorpha, Cladonia pocillum, Cladonia cristatella, Cladonia pityrea, Cladonia bellidiflora

Distribution and Habitat

• Cladonia species are found across the boreal forest.
• They often grow on moss, particularly Chorisodontium.
• They can also be found on logs, at the base of trees, on rock outcrops, and in exposed subalpine sites with poor soils.

Morphological Characteristics and Growth Habits

• Cladonia species are moss-like lichens.
• Some species have upright fruiting stalks.
• They exhibit cup-shaped structures called podetia, sometimes described as resembling "Shrek's Ears" or miniature golf tees. These podetia can be funnel-shaped and taper towards the base.
• The "pixie cup" lichen has tiny cups, approximately 1/2 inch high.
• Some species have podetia that proliferate from the margins of the cup.
• The exterior of the podetia can be clothed with corticate granules.
• Soredia are often abundant and farinose (powdery).
• Some species have red apothecia.

Quirky Facts

• Some people think these lichens resemble Shrek's Ears or miniature golf tees.
• Historically, a preparation made by boiling Cladonia with milk or syrup has been used as a remedy for whooping cough and chest ailments.