14 Transactions British Mycological Society. 
7. Variable in shape (filamentose to conical or vesi- 
culose): Mycena leptocephala (Pers.) Fr., Mycena 
stannea Fr., Mycena sudora Fr., Mycena alcalina Fr. 
B. On gill surface also. 
a. Thick, rigid, filamentose: Mycena gypsea Fr. 
b. Bluntish, conical: Mycena vitilis Fr. 
c. Short, clavate, vesiculose, setulose: Mycena crocata 
(Schrad.) Fr. 
d. Acutely conical, containing many oil drops: Mycena 
parabolica Fr., Mycena spetrea Fr. 
e. Filamentose to fusiform, contents watery: Mycena 
galopus (Pers.) Fr. 
C. Cystidia absent: Mycena cyanorhiza Quél. 
I have cited this last which is not British because I know of no 
British example of the section. I am aware that some observers 
consider there are no cystidia in Mycena epipterygia (Scop.) Fr. but 
I can confirm von Hoehnel’s statement that they are present in 
very young specimens. Ever since I obtained a copy of this 
paper I have carefully examined a considerable number of the 
cystidia in the commoner species of Mycena and in the main 
I agree with von Hoehnel’s description of them, but I certainly 
differ from Schroeter with regard to Mycena filopes (Bull.) Fr. 
This species is characterized by broadly pyriform, or obovate, 
minutely spinulose cystidia which form a compact layer on the 
gill edge, and are not cylindrical and pointed as Schroeter has 
described them. To appreciate the correct shape of the cystidia 
it is necessary to work with freshly gathered material as they 
alter considerably in form when kept in tubes or a tin box for 
a comparatively short time, and this applies more especially to 
the cylindrical and filamentose ones. In his sixteenth “Frag- 
mente”? von Hoehnel also lays considerable stress on the fact 
whether the basidium is provided with two or four sterigmata. 
I admit that this is a feature of some diagnostic value but I 
should be very loath to separate one species from another on 
this character alone, because one often notices basidia with two 
or four sterigmata on the same gill and in the Corticia and allied 
genera it is a very common feature. I think it is much better 
to describe a species as having basidia with two to four sterig- 
mata than to make the form with two sterigmata a variety as 
Lange does with Mycena lactea (Pers.) Fr. var. pithya A. & S., 
or to treat it as the type as Lange does with Mycena filopes 
(Bull.) Fr. and refers the one with four sterigmata to the forma 
tetraspora Lange. In the following year, 1914, Lange published 
his revision of ‘‘The genus Mycena”’ in his “Studies in the 
Agarics of Denmark” which appeared in the Dansk. Bot. Ark. 
