166 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
but others force their way out from the cells below, and an extensive 
secondary mycelium is quickly formed which again produces bulbils 
in profusion. Thus it is seen that the bulbil belongs entirely to the 
secondary mycelium, since it is invariably formed on a clamped hypha, 
and gives forth germ tubes which bear clamps immediately. 
No conidia have been seen in cultures of bulbils although the writer 
has repeatedly sought for them. As stated above, it appears that the 
conidia belong to the early period of development of the fungus,— to 
the primary mycelium and the first growth of the secondary — while 
the bulbils succeed them, and are such a successful means of repro¬ 
duction that the conidia are not again resorted to. 
Other bulbils belo7igmg to Basidiomycetes .— The writer has under 
cultivation two other kinds of bulbils which are proved to belong to 
species of Basidiomycetes, inasmuch as the mycelia are profusely 
clamped and basidiosporic hymenia are produced in pure cultures. 
Unfortunately the writer has thus far succeeded in producing only 
very imperfect specimens of hymenia with scattered basidia, from 
which specific diagnosis is impossible. The bulbils of one of these 
species were found by Dr. G. P. Clinton in the vicinity of Cambridge, 
Massachusetts, on a fragment of an old newspaper in a field. They 
are of about the same size as those belonging to Corticium alutaceum, 
but are somewhat lighter-colored, the component cells are smaller 
and more closely and evenly compacted, and the form is more regu¬ 
larly spherical. The method of formation of these bulbils agrees 
exactly with that described above for Corticium alutaceum, except 
that in the early stages the branching is more loose and open. Aris¬ 
ing from the normal clamped mycelia in drop cultures are many freely 
branching hyphae of smaller caliber which produce conidia in con¬ 
siderable abundance of the type found in Corticium alutaceum. In 
wood cultures small rhizomorphic strands are at first formed thickly 
upon the substratum, but these are soon covered and partially con¬ 
cealed by the innumerable bulbils. 
The bulbils belonging to the second species mentioned above were 
discovered by Mr. A. H. Chi vers in a gross culture of bits of wood, 
paper, etc., from the floor of a woodshed in Hanover, New Hamp¬ 
shire. This species is very similar in most respects to that just de¬ 
scribed, but is readily distinguished in cultures, even with the naked 
eye, by the much lighter rusty-cinnamon color of the bulbils, and by 
the very numerous, white, fibrous strands of hyphae which radiate 
