348 Transactions. — Botany. 



pallid or whitish, 6-15 cm. broad, entire texture corky; gills 

 radiating from the point of attachment, forking, narrow, often 

 anastomosing laterally to form sinuous pits of various lengths, 

 closely crowded, coloured like the pileus ; spores hyaline, 

 elliptical, 5 x 3 ^u,. 



On dead wood. Northern Island, New Zealand. Australia, 

 Borneo, Ceylon, Himalayas, China, Andaman Islands, Mauri- 

 tius, West Africa, West Indies, United States. Absent from 

 Europe. 



A beautiful and widely distributed species, closely re- 

 sembling Lenzites deplanata, Fries, and L. applanata, Fries, 

 differing from both in the pileus being glabrous and marked 

 with raised concentric zones or ridges. The corky gills are 

 narrow and very closely crowded, and anastomose to such an 

 extent that the hymenium consists of more or less elongated 

 pits, as in Dadalea, rather than of gills. The present genus 

 connects the Agaricinccz with the PolyporecB. The corky sub- 

 stance is that of the latter. 



130. Lenzites betulina. Fries, Epicr., p. 405 ; Austr. Fung., 



p. 101 ; Sacc, Syll. v., no. 2630. 



Pileus horizontal, sessile, attached behind by an expanded 

 base, more or less reniform or semicircular, tomentose or 

 minutely velvety, pallid, slightly zoned, tinged brownish, 

 becoming pale, margin similar in colour, 5-12 cm. long, 

 2-5-6 cm. broad; flesh up to 8mm. thick behind, becoming 

 gradually thinner up to the acute straight margin, corky and 

 elastic, white ; gills rather thin, radiating from the point of 

 attachment of the fungus, broad, forked and anastomosing, 

 straight, dingy-white ; spores elliptical, smooth, 4 x 2 /*. 



On trunks, stumps, &c. Dannevirke, New Zealand. Aus- 

 tralia, Europe, Siberia, United States. 



When young the gills are thickish, somewhat joined to- 

 gether here and there, resembling pores ; at a later stage of 

 development they become thin, with a thin shai-p edge. Im- 

 bricated as a rule. Entire fungus corky and tough, firm and 

 rigid, usually indistinctly zoned. 



EXPLANATION OF PLATES XXIL-XXIV. 



Plate XXII. 



{These diagrams illustrate the principal types of structure used 



in describing Agarics.] 



Pig. 1. Section showing an infundibidiform or funnel-shaped pileus, a, 



and decurrent gills, h. The stem is hollow. 

 Fig. 2. Section showing an liinhilicate pileus, a, and adnate gills, b. 



The margin or edge of the pileus is involute or incurved, c. 



