A NEW FOSSIL FUNGUS 129 
a younger stage of development, as is shown att the almost com- 
plete absence of projections—occur which are more transparent, 
and i — under a high power sigs - strong ilaninatan it can 
be seen that each _ body is not a compound mass of cells, 
but : ig “ (fig. 2). It seems se therefore, that each is to 
be regarded, not a a perithecium with appendages, but as a single 
spk with a spinous epispore. On the precise determination me 
these spores I am not able at present to throw any light. It m 
be steric out capi that neither in the small size of the eapposed 
‘‘ perithecium " nor in the nature of the ‘‘ appendages”’ do t 
present Eajects bear the slightest resemblance a any of the spacial 
of the genus Uncinula of the Erysiphacee (cir. 8 almon, Monogr. of 
the et (Mem. Torr. Bot. Club, ix. 79-120 (1900) ); and 
‘‘ Sup tary Notes, &c.” (Bull. Torr r. Club, xxix. 96- 103 
1902 
( 
In the same mount with the ‘ Hie eos fragments of myce- 
lium and shat of globose spore-like bodies occur. These mycelial 
hyphe are 5-8» in diam., and rather slosely septate. They can 
be seen clearly giving rise to rows of en arged more or less globose 
cells, which are at first somewhat hyaline (so that the wall of each 
cell is apparent), but which become finally more or less opaque. 
The enlarged cells measure from 15 to 23 » in diam., and sometimes 
occur clustered, as shown at fig. Side In the same slide similar 
hyphe are ve which give rise pansions two cells wide in 
places (figs. 3, 4, 5). It is soentle that these are the early stages 
in the formation of the clustered enlarged cells (cfr. figs. 
8, 4, 5, and 9). 
These hyphe agree in the production of enlarged opaque spore- 
like cells so closely with those of Cercospora acerina, described by 
artig (Untersuch. aus dem forstbot. Institut zu Munchen, 1, 60 
feel that 4 the prow fungus may safely, I think, be referred to 
this Hartig (l.c.) thus describes this stage of development 
in O° abe “ Nachdem die Conidienbildung beendet ist, sieht 
man das Mycel hier und da anschwellen und eine zunachst braun- 
liche Farbung annehmen. Die Umwandlung des Mycels zu einem 
aidigen Dauermycel, zu der einfachsten Form der clerotien, 
schreitet fort, bis die ganze Blattsubstanz von zahlreichen Ketten 
und Gruppen desselben durchzogen te Die Zellen des Mycels 
schwellen bei dieser Umwandlung zuniichst an. Es finden weitere 
Zelltheilungen theils parallel den eens ee aeegerdabe a= 
theils rechtwinklig zu diesen statt, so dass zuweilen complic 
Gewebekérper entstehen. Im Aligemeinen bleiben aber Bese 
Dauerzustinde einreihig sat es sind imm ur kleinere oder 
gréssere Gruppen von Yellen, welche _ Umwandlung erleiden, 
wahrend die sie verbindenden an der Um andlung nicht theilneh- 
abste 6 .’ The figures given 
by Hartig (J.c. Taf. iv.) of the enlarged cells, which function as 
sclerotia of the mycelial hyphe of Cer ee rtiSe acerina, get closely 
with those pia from the fossil examples occurring in the slide 
sent by Dr. Pampaloni, as may be seen by comparing age o with 
figs. 10- 
Seva or Botany.—Vou, 4. [Arnit, solic ete: 
