Xanthoparmelia monadnockensis
Xanthoparmelia monadnockensis is a species of foliose lichen in the family Parmeliaceae, described by John Elix in 2003. It is native to Western Australia, particularly found in the Monadnocks Nature Reserve near Jarrahdale.
Taxonomy
Xanthoparmelia monadnockensis is part of the genus Xanthoparmelia, known for its diverse species of foliose lichens. This species was identified as distinct due to its unique morphological features and chemical makeup, differing significantly from similar species such as Xanthoparmelia centralis.Description
The thallus of Xanthoparmelia monadnockensis is small-foliose, loosely attached to the, and can grow up to wide. The are flat, more or less linear, and range from 0.5 to 1.2 mm wide, featuring more or less to irregular branching. The upper surface is initially yellow-green but quickly darkens, becoming shiny at the tips and developing cracks that lead to an centre. The lichen is characterised by dense, cylindrical isidia that become richly branched in a coral-like pattern and have dark, fragile tips.The lower surface is pale brown and flat, with sparse, robust, brown rhizines. No reproductive structures such as apothecia or pycnidia have been observed to occur in this species.
Chemical spot testing of the lichen shows no reaction to potassium hydroxide on the cortex or medulla, but is KC+ on the medulla. It contains significant amounts of usnic acid and barbaric acid, with minor amounts of 4-O-demethylbarbatic acid, which help define its distinct chemical profile.