Entwicklungsgeschichte 
85 
Referate. 
HIGGINS, B. B., Contribution to the life kistory and pkysiology 
of C ylindrosporium on stone fruits (Amer. Journ. Bot. 1914, 
1, Nr. 4, 145—173; pls. 4). 
This comprehensive study concerns species of Cylindrosporium 
occurring on species of Prunus. Three of them were found to possess 
ascogenous stages, Coccomyces hiemalis , C. prunophorae and C. lutescens , 
the first of whick has previously been described (Science N. S. 1913, 37, 
637 —638) by the author and the last two of which are herein described 
as new. Cross inoculations of this species show a correlation of natural 
groups of hosts with the distinguishing cliaracters of the ascogenous 
stages. Whether or not Cylindrosporium Padi occurs in North America 
is not known. Careful consideration is given to the development of the 
Cylindrosporium acervuli and conidia, to the microconidia, spermatia-like 
bodies born in pycnidial structures, to the stroma in which ascogonium- 
like structures with a projecting trichogyne from which the apothecium 
and ascospores are developed, and to the apothecial conidia. Infection 
experiments using ascospores from leaves and conidia in pure culture 
from ascospores proved the genetic Connections. The mycelium is 
intercellular in the Cylindrosporiums studied and they obtain tkeir food 
by haustoria. which penetrate the kost, cells. 
Special attention is given to the phenomenon of „skotkole“ develop¬ 
ment. It is apparently correlated with the presence of amygdalin. The 
breaking down of the complex amygdalin molecule, thereby increasing 
the osmotic pressure in the cells in the advance of the mycelium, causes 
these cells to enlarge forming the Separation layer. 
F. A. Wolf (Auburn, Ala.). 
GUILLIERMOND, A., Nouvelles observations sur le chondriome de 
Fasque de Pustularia vesiculosa. Evolution du chondriome 
pendant les mitoses et la formation des spores (Compt. Rend. 
Soc. Biol. 1913, 75, 646—649). 
Apres la formation des granulations metachromatiques et des globules 
de graisse par le chondriome, l'asque elabore activement du glycogene; 
il est probable que le chondriome prend egalement part ä cette elabo- 
ration. Pendant les divisions nucleaires, le chondriome semble etre ä 
peu pres inactif; pendant la formation des spores, au contraire, les chon- 
driocontes de la moitie superieure de l’asque se raccourcissent et viennent 
pour la plupart s’introduire dans les ebauches des spores. Les elements 
du chondriome s’allongent ä nouveau dans la spore lors de sa maturation. 
R. Maire (Alger). 
NIENBURG, W., Zur Entwicklungsgeschichte von Polystigma 
rubrum DC. (Zeitschr. f. Botan. 1914, 6, 369—400). 
Bekanntlich sind die Sexualverhältnisse von Polystig??ia rubrum 
bereits mehrfach Gegenstand der Untersuchung gewesen. In letzter Zeit 
haben Blackman und Welsford aufs Neue die Aufmerksamkeit auf 
diesen Ascomyceten gerichtet durch ihren Befund, nach welchem das an- 
