Friesia III, 1

- 51 -
nucleus (Fig. 5-7). From the very first the chromatin material of
the latter is definitely aggregated in definite patches, always 8 in
number (Fig. 4). Coincident with the rapid contraction the nucleolus
and also the nuclear membrane disappear (Fig. 8), and 4 gemini
are densely massed near the center of the hypobasidium (Fig.
8-9). The chromosomes separate 4 and 4 in meiosis and migrate
to the opposite poles of the inconspicuous, transversely oriented
spindle (Fig. 10-13). Subsequent to the organisation of the
daughter nuclei a second division occurs (Fig. 15-16), so that a
mature hypobasidium has 4 nuclei (Fig. 17-18).
The migration of the nucleus (Fig. 18) begins when the formation
of the septa is complete. During migration the nucleus becomes
extremely elongate in order to pass through the narrow
epibasidium and sterigma (Fig. 18). The mature spores are vacuolate
and uninucleate (Fig. 19).
LITERATUR
Neuhof, W. (1924): Zytologie und syste matische Stellung der Au ricula..
riaceen und Tremell ace en. Bet, Arch. 8 : 250-297.
Whelden, R. M. (1934): Cytological studies in the Tremellaceae. I.
Tr emella. Mycologia 26 : 415-435.
Whelden, R. M. (1935): Cytological studies in the Tremellaceae. II.
E xidia. Mycologia 27 : 41-57.
Whelden, R. M. (1935): Cytological studies in the Tremellaceae. III.
Sebacina. Mycologia 27 : 503-520.
Whelden, R. M. (1935): Observations on the cytology of Sebacina globospora,
n. sp. Rh odora 37 : 121-128.
København, Maj 1943.