CLAVIS AGARICINORUM. 181 



— Pileus mo;;e or less membranaceous, generally striate, with the 

 margin always straight, and at first pressed to the stem (never involute), 

 expanded, campanulate, and generally umbonate (not depressed as in 

 Omphalid) ; stem externally cartilaginous, tubular, not stuffed when 

 young, confluent with the hymenophorum, but heterogeneous from it ; 

 gills never decurrent, though some species have a broad sinus near the 

 stem. — Hab. Mostly epiphytal. 



Most of the species are small, beautiful, and inodorous, but some 

 which have a strong alkaline odour are proljably poisonous ; none are 

 known to be edible. They appear after rain in summer and autumn. 



Mycena con'esponds with Nolanea, Plate CI. fig. 17 ; Galera, 

 Plate CII. fig. 24 ; Psathyra, Plate CIII. fig. 31 ; and Psathyrella, 

 Plate CIV. fig. 34. The species figured is Agai-icus (Mycena) poly- 

 yrammus,^\i\\. Spores -00033'' x •00036". Two forms of a young 

 A. (Mycena) epipterygius. Scop., are given on the plate, to show the 

 margin of pileus adpressed to the stem. 



Pries, in his ' Monographia Hyraenoraycetum,' alters the sequence 

 of Mycena and OmpJialia as given in his 'Epicrisis,' and places Om- 

 pJialia first. The arrangement of the ' Epicrisis ' seems to me more 

 natural, as Mycena is certainly intermediate between Collybia and Om- 

 jjlialia, the gills being adnate in the former and decurrent in the latter. 



Subgenus 9. Omphalia, Fr. Epicr. p. 119 (Plate C. fig. 9). — 

 Pileus generally from the first umbilicate, afterwards funnel-shaped, 

 almost always membranaceous or submembranaceous and hygropha- 

 nous, margin incurved or straight ; stem cartilaginous and tubular, 

 when young often stuffed, confluent with the hymenophorum, but hete- 

 rogeneous from it; gills truly and considerably decurrent. — Hab. Gene- 

 rally epiphytal, and mostly peculiar to hilly regions, preferring a damp, 

 woody situation, and a rainy climate. 



Omphalia corresponds with Eccilia, Plate CI. fig. 18 ; Tubaria, 

 Plate CII. fig. 25 ; and Deconica, Plate CIII. fig. 32. The species, 

 though small, are many of them beautiful ; their properties are not 

 known, and they endure changes of temperature like the hygropha- 

 nous species of ClUocybe. Omplialia is naturally divided into two 

 groups, one, Collybarice, approaching Collybia in the involute margin 

 of the pileus, but differing in the deeply decurrent gills and umbilicus, 

 and the other, Mycenarim, pointing to Mycena in the straight margin 

 of the pileus, at first adpressed to the stem, but differing in the nature 



