OBSERVATIONS ON MICROGONIDIA. 
145 
gyrosely agitated (and also in the spores of Agaricus rimosus). 
This is a discovery exactly of the same nature as that of Micro- 
gonidia; and they are in reality nothing more than the same 
“ molecular granulations.” The motion which he saw is evidently 
merely the well-known Brownian movement * — an ordinary property 
of molecular granulations to agitate themselves where sufficient 
space is allowed them. This is an elementary and well-known 
matter. 
PREPARATIONS OF LICHENS FOR THE 
MICROSCOPE. 
Mr. W. Joshua, of Cirencester, has prepared a series of 48 slides, 
illustrating the genera and species of British Lichens. These are 
but the first issue of what is intended to be a complete collection, 
as far as possible, of typical forms. The price of the set is three 
pounds, which contains the following species : — 
No. 
Tribe. 
Fasciculus 1. 
1 
Lichenei. 
Gonionema velutinum. — Nyl. 
2 
» 
Ephebe pubescens. — Fr. 
3 
Lichina pygmsea. — Ag. 
#4 
Collemei. 
Pyrenopsis granatina. — Smft. 
#5 
Collemopsis Arnoldiana. — Nyl. 
6 
Synalissa symphorea. — D.C. 
*7 
jj 
Collema myriococcum. — Nyl. 
8 
j? 
„ pulposum. — Bernh. 
9 
„ multipartitum. — Sm. 
10 
55 
„ nigrescens. — Huds. 
#11 
55 
„ aggregatum. — Ach. 
12 
55 
„ biatorinum. — Nyl. 
13 
55 
Leptogium plicatile. — Ach. 
14 
55 
„ Burgessii. — Lghft. 
15 
55 
,, muscicolum. — Sw. 
16 
55 
,, Schraderi. — Bernh. 
17 
Myriangiei. 
Myriangium Duriaei. — Mnt. 1 
*18 
Caliciei. 
Calicium septatum. — Leight. 
*19 
>> 
Trachylia tigillaris. — Fr. 
20 
Stictei. 
Ricasolia glomulifera. — Lightft. 
21 
Peltigerei. 
Peltigera venosa. — L. 
22 
j? 
„ horizontalis. — L. 
*23 
>> 
Solorina bispora. — Smft. 
24 
,, crocea. — L. 
Physcia pusilla. — Am. 
25 
Pbysciei. 
26 
„ ciliaris. — L. 
27 
Pertusariei. 
Pertusaria globulifera. — Turn. 
* Vid 
Nyl. in 
. “ Lindsay Popular History of British Lichens,” pp. 
“ Flora,” l. c. 
