Pin-cushion Sunburst

Polycauliona polycarpa

Bright clusters of orange rise from the bark like tiny cups, packed tightly together on slender twigs. The thallus forms a small, irregular tuft, often overwhelmed visually by its many vivid apothecia. In softer light, the color shifts from deep amber to glowing tangerine, standing out against muted gray bark. This species is often found in mixed lichen communities, sharing space with pale gray rosettes and yellow granular patches on nutrient-rich branches.

For identification details and comparison with other similar species, see
the Polycauliona polycarpa in the Field Notes section.

A vivid cluster of Polycauliona polycarpa forms a tightly packed, cushion-like mass along a narrow twig, its surface crowded with bright orange apothecia. The short, flattened lobes are largely obscured by the abundance of fruiting bodies, giving the colony a textured, almost granular appearance from a distance. Unlike fruticose lichens, the structure resolves into compact, overlapping lobes rather than true branching axes. The bright orange contrasts strongly with the pale gray crustose lichens on the bark, emphasizing the species’ tendency to form small, elevated colonies on exposed twigs in nutrient-rich environments.

Pin-cushion Sunburst Rising Above Physcia orbicularis
A vivid orange cluster lifts above a patch of blue-gray rosettes, highlighting a classic bark-dwelling lichen community.
Camera: Canon EOS 5D Mk IV
Lens: EF100mm f/2.8L Macro IS USM
Settings: ISO 3200 • Aperture f/8 • Shutter 1/500 s
E22A0106 • Size: 3096x2064

A dense tuft of Polycauliona polycarpa rises from the surface of a birch twig, its bright orange apothecia forming a compact, cushion-like crown above a colony of Physcia orbicularis. The gray lichen spreads in low, overlapping rosettes, tightly appressed to the bark and dotted with small, dark discs. The contrast in form—upright and clustered above, flat and layered below—creates a clear visual separation between the two species. Together, they illustrate a common pairing on nutrient-enriched bark, where multiple lichens share the same narrow substrate while occupying different structural niches.