Homothallism and monosporous mycelia in Coprinus. 217 
Fig. 14. Coprinus stellatus. A branched hypha showing a simple septum. 
From a compdund mycelium of polysporous origin, the spores having 
been derived from a wild fruit-body. 
Fig. 15. Coprinus cordisporus. A branched hypha showing a simple septum. 
From a compound mycelium of polysporous origin, the spores having 
been derived from a wild fruit-body. 
PraTeE VII. 
Fig. 1. Coprinus sterquilinus. Two horse-dung cultures from which fruit- 
bodies have been developed, made simultaneously. The cotton-wool plugs 
were removed 48 hours ago to allow the fruit-bodies to elongate without 
being injured. The culture tube on the left contains a mycelium of mono- 
sporous origin. This mycelium has just given rise to its first fruit-body with 
its spores which completes the last of a series of five successive generations 
of monosporous cultures. The culture tube on the right contains a com- 
pound mycelium of polysporous origin derived from spores of the same 
fruit-body as that which provided the spore for the culture already 
described. This compound mycelium has given rise to a fruit-body which 
expanded, shed spores, and exhausted itself on the day before the photo- 
graph was taken. Seven-tenths natural size. 
Fig. 2. Coprinus lagopus. Photograph of a group of fruit-bodies which has 
come up on sterilised horse-dung contained in a large crystallising dish. 
The mycelium was of monosporous origin and the original spore was 
derived from a wild fruit-body. The mycelium was transferred to the 
culture medium only 12 days before the photograph was taken. The 
pilei are covered with characteristic loose white scales and are ripening 
their spores in preparation for the elongation of the stipes and pilear 
expansion. Natural size. 
NOTES. 
LONGEVITY OF SPORES OF A FUNGUS 
IN A MUSEUM SPECIMEN. 
For comparison with a fungus which had been isolated from 
and proved to be the.cause of black spots on leather, a small 
portion of a piece of the bark of a lime tree covered with a 
black sooty deposit, was given to me from the Herbarium of 
the British Museum (Natural History) in June of this year. 
The specimen was from the Rabenhorst-Klotschu, Herbarium 
vivum Mycologicum, Editio m1, Series 1, No. 75, and was de- 
scribed as Cladosporium fumago Lk. It had been obtained from 
Sachs, Switzerland, in the summer of 1854. The cabinets in 
which the specimen had been kept in the Museum are saturated 
with camphor. Small portions of the bark were placed on slopes 
of Beer Wort Agar, Czapek’s and other media and incubated 
for some days without showing any signs of life. A piece placed 
in a tube of sterile Beer Wort also showed no signs of growth. 
The following technique was however successful: 
A tube of sterile Beer Wort was kept in a slanting position, 
a small piece of the bark was introduced, dipped under the 
