Public Description of Physciaceae Zahlbr.

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Name: Physciaceae Zahlbr.
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Ascomycota
Class: Lecanoromycetes
Order: Caliciales


Diagnostic Description:

This family of lichens is probably best recognized by the distinctive spores: brown, 1-septate, elliptical. In the absence of macroscopic characters, the ontogeny of the spore is of critical importance: when the septum forms; presence of any thickenings in the septum, walls, and/or tip in the various stages of development; presence of bands of pigment around the cells and around the septum; mature spores sometimes swelling around the septum in KOH.

Crustose Genera:

Buellia apothecia lecideine, hypothecium gen. dark
Rinodina apothecia lecanorine, hypothecium gen. hyaline
Dimlaena apothecia initially cryptolecanorine, spore walls not thickened
Diploicia apothecia initially immersed, lecideine, spore walls thick

Foliose Genera:

Anaptychia upper cortex K-, prosoplectenchymatous, lower cortex often lacking
Heterodermia upper cortex K+y, prosoplectenchymatous, lower cortex often lacking
Physcia upper cortex K+y, lower cortex present
Physconia squarrose rhizines
Phaeophyscia lower cortex paraplectenchyatous
Physciella lower cortex prosoplectenchymatous
Hyperphyscia pycnoconidia, lower cortex rudimentary with few or no rhizines
Dirinaria tropical, v short rhizines (hapters)
Pyxine tropical, occ. lecideine

Other genera:

Phaeorrhiza is a crustose to squamulose genus with black fuzzy rhizine-like hyphae below. It appears to be treated with Rinodina in the Sonoran Flora. I’m not sure what its status is. -JPH

Buellia has been split into several genera by various lichenologists, including Diplotomma, Amandinea, Hafellia, Baculifera, Gassicurtia, among others. However there is little agreement on most of these, and some are definitely not well-defined. It looks like at least Diplotomma and Amandinea will be accepted with minor changes, while Haffelia, although apparently well-defined, is more problematic since the type of Buellia s. str. falls within the definition of Haffelia. Expect additional genera to be created from the residue in Buellia s. l. as research continues.


References:

Description author: Nathan Wilson (Request Authorship Credit)
Description editors: Jason Hollinger, nastassja, Joseph D. Cohen