Presidential Address. Carleton Rea. 13 
regrouping of the species of Mycena contained in his fifteenth 
‘“Fragmente,”’ 1913. In this he rearranges the species on a 
system based upon the cystidia which we all know are generally 
present in most of the species of this genus. His classification 
is founded on their presence or absence, their occurrence on the 
gill edge only and also on the gill surface, their coloured or 
colourless contents, their early deliquescence or permanence, 
and their various shapes. I think it will probably interest you 
if I show you how this applies to our British species according 
to his investigations. 
A. Cystidia small, oval, shortly setulose, soon entirely delique- 
scent: Mycena viscosa (Secr.) Maire, Mycena epipterygia 
(Scop.) Fr. 
B. Cystidia permanent. 
1. With coloured contents. 
a. On gill edge only. 
Sharply pointed above, ventricose below: Mycena 
avenacea (Fr.) Schroet., Mycena rosella (Pers.) Fr., 
Mycena rubromarginata Fr., Mycena sanguinolenta 
(Arco S.)) Er, 
B. On gill surface also. 
a. Globose, oval, setulose: Mycena elegans Fr. 
b. Narrow, conical: Mycena pelianthina Fr. 
c. Acutely pointed above, ventricose below: Mycena 
vosella (Pers.) sensu Schroeter. 
2. With colourless contents. 
a. a gill edge only. 
. Globose, oval, generally setulose: Mycena corticola 
(Pers.) Fr., M ycena galericulata (Scop.) Fr., Mycena 
rugosa Fr., Mycena tenella Fr., Mycena vitrea Fe 
Mycena vulgaris (Pers.) Fr. 
Oval, with few setae: Mycena dissiliens Fr. 
Oblong, vesiculose: Mycena pura (Pers.) Fr. 
. Bluntly conical above, ventricose below: Mycena 
lactea (Pers.) Fr., Mycena luteoalba (Bolt.) Fr., 
Mycena metata Fr., Mycena polygramma (Bull.) Fr., 
Mycena rorida Fr., Mycena stannea Fr. 
e. Cylindrical, filamentose: Mycena filopes (Bull.) 
sensu Schroet., Mycena hiemalis (Osb.) Fr., Mycena 
polygramma (Bull.) Fr., Mycena stylobates (Pers.)Fr. 
. Vesiculose, conical: Mycena zephira Fr. 
. Short, filamentose, indistinct: Mycena citrinella 
(Pers. ): Br: 
h. Long, filamentose, often ventricose below: Mycena 
flavipes Quél., Mycena rubella Quél. 
oS 
eS, 
