F>hysciaceae. 



Thai 



illus membranaceous, laciniate, occasionally arbuscular, fixed 

 to the substratum by rhizines, stratified, with Protococcus-gonidiaL. 



Apothecia (in our genera) lecanorine, paraphyses septate, undivided 

 or branched, spores brown, one-septate. Fulcra endobasidial, articu- 

 late, pycnoconidia short, straight. 



The Lichen species, now referred to the genera Physcia and Anap- 

 tychia, were for the greater part referred to the genus Parmelia by ACHA- 

 RIUS, some of them to Borrera or to Lecanora. ELIAS FRIES* constructed 

 the name Physcia as a tribus of Parmelia, comprising our Physcia and 

 Anapty cilia, whilst our Parmelia was included in another tribus of Par- 

 melia, Imbricaria. Imbricaria was described as having Discus . . . strato 

 gonimo impositus, Physcia as having Discus . . . strato medullari im- 

 positus. FRIES did not use the microscope. A microscopical investigation 

 shows that there is a well-developed stratum of gonidia under the hypothe- 

 cium in our Parmelia, which stratum is either wanting in Physcia or 

 poorly developed, consisting of a few scattered gonidia. 



KOERBER 2 reserved the name Imbricaria for our Parmelia, the name 

 Parmelia for our Physcia and Anaptychia, and the name Physcia for our 

 Xanthoria. MASSALONGO 3 employed another nomenclature, and used the 

 name Anaptychia for our Physcia and Anaptychia, making no distinction 

 between them. His Physcia comprises our Xanthoria and Caloplaca, 

 whilst his Parmelia agrees with our comprehension of the name. 



KOERBER and MASSALONGO were among the first lichenologists to 

 employ microscopical characters as the base of their systems, and accor- 

 dingly they were able to make use of the form of the spores as an im- 

 portant character. 



1 FRIES, ELIAS. Systema Orbis (1825) p. 242. 



2 KOERBER: Systema Lichenum (1855) p. 68. 



3 MASSALONGO: Memorie Lichenografiche (1855) p. 33. 



Vid.-Selsk. Skrifter. I. M.-N. Kl. 1916. No. 8. 1 



