A neiv Australian Stone-making Fungns. 167 



rows much larger, ovate to elliptical, deepest on the inner end ; 

 circumference sub-circular, broad marginal zone smooth, undulate, 

 not pitted promiscuously or sometimes in some parts irregularly; 

 ridges of pits and margin of pileus cofFee-colour, the latter deeper 

 in colour because thicker ; inner substance of pileus thick, 

 wliitish, unchangeable. Hymenophore greyish-fawn to reddish- 

 brown, solid, continuous with stem ; tubes adnate, averaging one 

 line in depth, slightly contracting towards opening ; pores 

 moderately large, crowded, unequal, sub-rotund to oval ; spores 

 spherical, orange-yellow, echinulate, 44-50 in. in dia. ; spines 

 conical, acute, 3 in. long. Stem compressed oval, ^ x f in. in dia.; 



piutuuerances, ana snows m tne ngurecl specimen also fragments 

 of roots and the vestiges of an ant tunnel. The underside is 

 only slightly convex, the abraided surface allowing the threads of 

 the profuse mycelium to be detected ; it appears similarly to other 

 specimens, to be much less impregnated internally by ferruginous 

 matter than externally. The figured specimen described above 

 was obtained through Mr. A. Molineux, RL.S. (Secretary of the 

 S. A. Agricultural Bureau), from the south-eastern border of 

 S. Australia, and reported as having been found in typical mallee 

 scrub. The mycelium forms the large permanent stony base, and 

 apparently induces the oxide of iron contained in the soil to bind 

 the mass (from the surface inwardly into a solid nodule. Such 

 stony nodules have been brought to the notice of one of us 

 (Mr. Tepper) on various occasions, by persons meeting them in 

 clearing arenaceous mallee lands. One of an almost regularly 

 oval-shape was obtained near Ardrossan, in Yorke's Peninsula, 



