104 



THE LICHEN FLORA OF QUEENSLAND, 



I. — Eumitria, Stirton. 



Axis thick corneous, hollow throughout its entire extent, 

 and only pervaded by the arachnoid medullary fibres, no 

 such fibres surrounding the axis, their invariable site in 

 Usnea, but instead a thin, beautiful, and rather dense 

 rufescent layer, outside which is the usual gonidial layer, 

 covered by the corneous cortex. The thin rufescent layer 

 is tinged a somewhat deeper red by K. "On the Genus 

 Usnea and another Eumitria," by J. Stirton, M.D. 



1. E. Baileyi, Stirton. 



Thallus pale blue-gray or ashy-pale, shining, stiff, erect or 

 prostrate, thickness often to 2 m.m., length 4 — 7 in., 

 branched ; the branches thin and often incurved or con- 

 torted, very much crowded with fibrillose branchlets. 

 Sn Apothecia (in one specimen) pale flesh-coloured, of medium 

 (Usnea) size, fibrillse with K turning 'golden yellow. (J. 

 Stirton on the Genus Usnea and another Eumitria). 

 Hub. — Near Brisbane. 



II. — Usnka, Hff'm. 



Thallus filamentous, erect and shrubby, or pendulous and 

 branched ; filaments round, having a cartilaginous or 

 leathery cortical layer, which is very likely to crack and 

 separate in annular fragments from a central thread of 

 white, cottony, medullary tissue, — thus giving the thalline 

 filaments a peculiar articulated and sometimes a moniliform 

 appearance. Apothecia peltate, with a thalline border, 

 terminal or lateral, concolorous or black, open from the 

 earliest stages of growth ; margin usually radiate-ciliate. 

 Spermagonia lateral, with simple sterigmata ; spermatia 

 cylindric, acicular, truncate. 



1. U. barbata, Ach. 



Thallus greyish green or straw-coloured, frequently in a 

 young state erect, rigid, and somewhat fruticulose, becoming 

 with age flaccid and pendulous. Stems terete, with numerous, 

 not crowded, reflexed, bristle-like secondary shoots, and 



