199] ‘URRE 
CURRENT LITERATURE 
405 
new species and several 
fees new varieties of P : 
asspecies in E . of Poa being descri 
work on the a a. ia, Elymus.—A ‘ iken e ae 2 wen 
the separate being p bli on ears in Bull. Herb. Boiss. (7: 24 és eis 
i ublished as Contri : + 24-05. 1999), 
most import ontrib. Bot. Mus. . poly 
— are as follows: Graminez i pe states The 
n. spp. anda . spp.), by E. MACKEL ; 
and th : new genus : , 
¢ fourth installment of conciiaile Bin by ee ee 
’ . LIER.-]uM. C. 
THE QUESTIOY 
adds some Seine a sexuality of Collema is discussed by Baur” who 
anditions preceding th servations to our imperfect knowledge of the eculia 
dbservation and Gres e ascocarp in this form. He confirms Stahl’s “ on 
achicarp and trichog 2 a more detailed account of the cytolog iy the 
the cells of the es wi than has yet been presented. It ae that 
“ate in communicati y sWisted archicarp and the trichogyne which rises from 
that run through a es one another by delicate staid of protoplasm 
Consists of Foes a in the center of each cross-wall. The entire mee 
making up the eh ies constituting the archicarp and the remainder 
that in the aoa i = trichogyne. Each cell contains a single nucleus, 
| ithers, Be intia. of the trichogyne being slightly larger than the 
pea ere observed fused with the projecting tips of the 
Medium si 
aud autumn, aaa of Collema will produce every season, § rin 
y hundreds of archicarps with their cichogieiets bat of 
The others gradually wither 
part of the 
robserved attached 
housands of archi- 
ound the 
An apothe- 
twelve 
these | 
€ss th 
an one per cent mature fruit 
ak 
are not final, his 
ej From observations 
1 of the tri fertilization, th 
richogs ertilization, the 
Syne gradually become disorganized, beginning from 
nged. Finally all 
‘nts out two ways in which 
. tttlization thi 
I 
th through a se ccomplished. Perhaps the sperm nucleus passes 
ate Cells of the melons cells of the trichogyne and fertilizes one 
carp; or it is possible that the sexual act may take 
fusion nucleus makes 
in the termi 
™m f 
Atak ‘a cell of the trichogyne, and that a 
| ra ; 
PWS: 563. 1858. nach der Sexualitat der Collemaceem 
Ber. d. deut. bot. 
