Lichen: Hypogymnia tubulosa
Pronunciation: Hypogymnia tubulosa
Conservation Evaluation: Least Concern
Body Type: Foliose
Description: The thallus (3 cm to 8 cm) is composed of a network of matt overlapping concave branches loosely attached to the substrate. It varies in colour from bluish-grey through green-grey to mineral-grey; the colour does not vary from a wet to dry thallus. Individual branches have a width of 2 mm to 4 mm and specimens can grow in length to 80 mm with the thallus taking on a wrinkled or rough appearance towards the centre. The thallus lobes around the perimeter are finger or tube-like and rise upwards from the substrate giving a semi-erect appearance. The tube-like lobes also fan out at the tips and are covered with soralia. Apothecia are rarely found.
The under surface of the thallus is almost black in colour and lacks rhizines.Soredia are abundant and form blanket-like or ring-shaped soralia over the lobe tips. Isidia are absent.
Chemical Test: K+ yellow, UV+ purple, KC+ red, Pd-.
Nature Notes: It tends to favour an acid substrate such as siliceous rocks, trees and Calluna (heather) stems and so shows a wide range of habitats from the sea shore to uplands. It often grows with H. physodes, but is less common. It is an indicator of old-growth forests. It is not very resilient when exposed to pollution. Hypogymnia is superficially similar to Parmelia species. Hypogymnia tubulosa produces an anti-bacterial substance.
Vice County distribution map of Hypogymnia tubulosa: See Map
Link: Map this species on the Lichen Survey
Other species recorded in Ireland
- Hypogymnia physodes (L.) Nyl.
Text and images © Paul Whelan, 2009.