806 
ON THE PILOBOLIDiE. 
It will be seen that Brefeld was unacquainted with the 
true cedipus and the true roridus. He was successful, however, 
in discovering 1 the zygotes of P. anomalies . 
In 1875 Van Tieghem for the first time 2 cleared up some of 
the confusion in which the subject had been plunged by previous 
authors, especially in relation to the Mucor roridus of Bolton. 
Bolton expressly describes his species, which he found in the 
neighbourhood of Halifax, as “ pellucid and white, sustaining 
a small globular head, like a minute pearly drop, with a black 
spot on its upper part, which gives to the globe the resem¬ 
blance of an eye in miniature.” No author but Klein had 
been able, up to this time, to meet with a species nearly 
resembling this description, and hence it was doubted by 
some, as by Persoon, Coemans, Greville, and Purton, whether 
it were really distinct; Klein, as has been said, failed to 
recognise it in his microsporus, and it was reserved for Van 
Tieghem to describe and figure 3 a form which possibly 
is that which Bolton had in view, and which is as identical as 
may be with Klein’s microsporus. The long, slender stem, 
the rounded swelling, the minute sporange, and the want of 
colour of Van Tiegliem’s species, all point in this direction, 
and agree pretty well with Bolton’s figure. I am inclined to 
anticipate, however, that the true species of Bolton, if it could 
be re-discovered, would be found not absolutely identical with 
Van Tieghem’s. In the same memoir Van Tieghem also 
instituted the new genus Pilaira for the reception of the old 
P. anomalas of Cesati, and added a new species Pilaira 
nigrescens. 
In 1878 Van Tieghem completed his work by publishing 4 
the descriptions of two new species, P. longipes and P. nanus, 
while at the same time he pointed out the error which Klein 
had made, and bestowed the name of P. Kleinii on the species 
with which he had worked. He also described the chlamydo- 
spores of P. nanus, a mode of reproduction which had already 
been signalised by Boze and Cornu 5 (1871) in the case of 
P. crystal!inns. 
Bainier, in 1882, published his “Etude sur les Mucorinees,” 
in which he describes specimens which he had met with of 
P. longipes, and also a new species P. exiguus ; he also con¬ 
firmed Van Tieghem’s account of Pilaira nigrescens. 
1 L.c., iv., 65. 
2 Nouv. Itech. sur Muc., pp. 42- -51. 
8 L.c., p. 46, pi. 1, figs. 7—13. 
4 Trois. Mem. sur Muc., pp. 24—31, pi. 10, figs. 6—22. 
5 Bull. Soc. Bot., France, xviii., 298. 
