BY JOHN BHIULET, B.SC. 



45 



uniseptate. Speruiagonia with arthrosterigniata : spermatid slender, 

 shortly cylindrical, at both ends more or less thickened. NjL Syn- 

 Lich. Vol. II. p. 1. 



I. — Pvxine, Fr. 



Characters as in the tribe — differs from Physcia in the 

 apothecium having both a thalhne and a proper margin, the former 

 is soon hidden, when the appearance is wholly lecideine. 



1. P. Meissnerii, Tuck. 



Thallus albo-glancescent, H — 2 inches in diameter, granu- 

 lose in the centre, indistinctly linear-laciniate at the margins, 

 lacinii« in radiate order and variously shaped, crustaceous- 

 contiguous and sub-imbricate, modeiately thin, margins 

 smooth, within flavescent Apothecia central, lecanorine 

 then lecideine ; margin (thalline) thin, pale, obsoletely 

 crenulate then hidden ; ditk plano-concave then plano- 

 Sn. convex, black ; hiypothecium thick, brown ; paraphyses 

 distinct, with iodine violet : spores 8, brown ; 1 -septate, 

 nearly cylindrical or oval-oblong, with one round globule in 

 in each cell, '015 — 017 x *006 — -007 m.nu Spermagonia 

 minute, indicated by a black or blackish point, colourless 

 within. 



Hab. — On bark of trees in the Brisbane Botanic Gardens. 



2. P. cocoes v, sorediata, Tuck. 



Thallus white or ashy-white drying sordid grey, plainly 

 linear-laciniate in division at margins, but lacinia? confluent 

 in centre, showing undulatious but no divisions ; whole 

 surface sorediate in white patches ; under surface supplied 

 Sn. with black rhizina?. Apothecia lecideine, of medium size ; 

 disk flat or plano-convex, rising from a yellowish stratum ; 

 spores 1-septate, -018 — -021 x -008—01 m.m. Differs 

 from P. Meissnerii in the broader and more uniform lobes, 

 and in the absence of the beautifully bright yellow medulla. 



Hab. — Green Island, Trinity Bay, on bark of trees. 



3. P. retirugella, tfyl. 



Thallus white or ashy-white, larger than P. cocoes, more or 



