LEUCOSPORI. 165 



pores 6-7 x 4 mk. B. Name integer, whole. Minute but perfect. Pers. Omphalia. 

 Ic. &" descr. t. 13. f. 5. Fr. Monogr. \. p. 193. Hym. Eur. p. 165. Icon. t. 

 75. f. 6. Berk. Out. A 134. C. Hbk. n. 230. Illust. PL 252. S. My col. 

 Scot. n. 208. 



A. buccinalis Sow. t. 107. An uncertain species. Fries {Hym. 

 Eur. p. 162) says it approaches A. stellatus chiefly in the stellate 

 base, but from the slightly fleshy pileus it is perhaps a young 

 form of A. umbelliferus. Berkeley (B. &> Br. n. 1930*) says, 

 " This is certainly no form of A. umbelliferus ; and it is too 

 fleshy to be the same as A. stellatus. It is, as Sowerby says, not 

 uncommon. It has the habit of A. ptychophylhis Cd., a species 

 not noticed by Fries ; but the gills are not plicate." C. Illust. 

 PL 272. a. 



Subgenus IX. PLEUROTUS (ir\vp6v, a side ; ofo, an ear). Fr. pieurotus. 

 Syst. Myc. i. p. 178. Stem excentric, lateral, or none. Epiphytal 

 {very rarely growing on the ground}, 

 irregular, fleshy or membranaccous. 



The Pleuroti are very easily dis- 

 tinguished from the subgenera with 

 cartilaginous stems (VI.-VIIL); but 

 from the other subgenera, which 

 have the hymenophore continuous 

 with the stem (III.-V.), they are only 

 distinguished by their place of growth 

 being on wood. For many Pleuroti 

 of the first section when growing ver- 

 tically e.g., A. corticatus, ulmarius, 

 spodoleucus have the stem central 

 and the pileus regular and horizon- 

 tal. On the contrary, various species 

 of Clitocybas and Omphaliae in a 

 slanting situation, especially on the 



sides of roads, vary in form and become excentric and oblique. 

 Among the Lactarii, Cantharelli, Marasmii, and all the last gen- 

 era of the Agaricini, there are also forms analogous to the Pleuroti. 

 Fr. Hym. Eur. p. 166. 



The species are very polymorphous. Usually late in the year 

 (but A. ostreatits also occurs in spring). Most are mild, and 

 some e.g., A. ulmarius^ tessulatus, ostreatus are edible. 



I. Excentrici. Pileus entire, laterally extended, excentric, so that here and 

 there it appears lateral ; but more attentively observed there is noticed even 



X. Agaricus (Pleurotris) corticatus. 

 One-sixth natural size. 



