Arthoniales

Roccella fuciformis

The Arthoniales are an order of Ascomycota. You are Flechtenbildner or live as Saprobionten on plants. The most crust-like lichens form with green algae.

Features

They usually make apothecia. Sometimes they are also closed and have an elongated, non-porous shaped opening. The peridium is thick or thin. The intermediate - asci - tissue consists of branched paraphyses in a gelatinous matrix. The asci are thick-walled and stain blue with iodine. The ascospores are aseptat or septat, sometimes brown.

The anamorphs are pycnidia.

System

To order includes four some very generic rich families and some genera of uncertain assignment:

• Arthoniaceae with 11 genera
• Chrysothricaceae with 2 genera
• Melaspileaceae with 2 genera
• Roccellaceae with 47 genera
• Incertae sedis Arthoniales Arthophacopsis
• Catarraphia
• Hormosphaeria
• Llimonaea
• Nipholepis
• Perigrapha
• Pulvinodecton
• Sipmania
• Synarthonia
• Tania
• Tarbertia
• Trichophyma
• Tylophorella
• Wegea