PLATE I

Wheii observing the white Mycélium of trufflc, without colouriiig it, it is quite impossible to detect partitions therein and seems to be likc a Mucorinea, so as even to be taken for a Mortierella.

FiG. 1. — The main lilament (looked at in the cell) is branching. Magnifying : 85.

FiG. 2. — Its outline is an irregular one and in its inner side one perceives a veiy granular protoplasma, spangled with numerous oildrops.

FiG. 3. — The filaments are often connected by anastomoses.

FiG. 4. — Their outline is very irregular and shows strumas as well as narrowness owing to the microscopical structure of the fungus. (See plate III.)

FiG. 5. — Some strumas of the main filament are like the Chlamidosporea of the Mucorinea.

FiG. 5'. — Sometimes they are met with where ramifications are branching off.

FiG. 6 & 7. — Towards the end of the main filament and less on its length we perceive, on small branches, ovoid and globular lumps of différent shapes and containing one or two oildrops, which seem to be the isolated Conidea of the Mortierella.

FiG. 8 & 9. — But some of them are prolonged at their end by a filament; so as to leave very little possibility of their being Conidea. (See fig. 22.) Their inner structure seems, moreover, to show that they are single strumas of the filament.

Fig. 10 & 11. — At its end, the main filament forms secondary ramifications, thin enough to give them a thrcady looking.