BY JOHN SHIRLEY, B SC. 



87 



is the name of a sub-genus of Oolleina distinguished by the 

 possession of simple spores. 



/lab. — On earth ; from specimen sent by Dr. Knight. 

 ***** Thallus rough beneath. 



S. L. hypotrachyum, Mull Arg. 

 M Victorian Naturalist, October. 1887, p. 80. 



III.— Obryzum, Wall 



Thallus foliaceous of many leafy incised lobes, grey or 

 brownish. Apothecia very small, angiocarpous, immersed in thalline 

 warts, with punctated pores. Spores skiff-shaped, 2-cellular, (> — 8 

 in each ascus. Gonidia moniliform. Founded by Wallroth on 

 0. corniculatum, which is now (the fruit) known a? Yerrucaria 

 corniculata, a parasite on a Leptogium, but at first beiieved to be a 

 Lept giuni with endocarpoid apothecia. It forms a convenient sub- 

 division for Collemei with immersed fruits. 



1. 0. scabrosum, Stirton. 



Parsitic upon the thallus of certain Oollemas. Apothecia 

 small, immersed, with outside somewhat raised and rough ; 

 perithecinm dimidiate, black ; spores 8, colourless, bluntly- 

 fusiform, 1-o-nucleate, seldom simple, -Ql2 — -018x 005.") 

 Sn. m.m. ; paraphyses irregular. Hym. gel. not coloured by 

 iodine, thecal changing yellow or pale- brown. Dr. Stirton 

 in Proc. Roy. Soc. Vic, Sept. 1880. Probably a parasitic 

 Verruca ria. 



Hah. — On fig-trees, Queen's Park, Ipswich. 



2. O. myriopus, Wilson f. isidiosum W 



Spreading over various Parmelias, Pannarias, &c, which 

 are saxicolous in habit. Thallus lead-coloured, fragile, 

 rugulose, dividing from the centre into wedge-shaped lobes 

 with their broadest ends at the circumference. Lobules 

 2-8 seldom more to each lobe, rounded, fissure-divided, 

 W bordered by short, dense, black hypothalline threads : mar- 

 gins often recurved, central portion densely sored ioid, black- 

 brown ; soredia in zones near the margins. Sterile. 



