1899] DEVELOPMENT OF CRYPTOMITRIUM 115 
of the Marchantiacee. They are almost cylindrical, and are 
composed of several rows of cells, which are formed from the 
original guard cells. These, instead of remaining single, divide 
by means of inclined walls into several cells. Generally four 
cells are cut off on the upper side (4, c, fig. 3), and two on the 
lower side of each original guard cell. 
Stephani, Joc. cit, reports that there are two furrows on the 
ventral side of the stalk or peduncle of. the receptacle, but I was 
unable to find such to be the case. In all the specimens exam- 
ined there was only one. Mr. Howe,’ also, reports only one 
furrow in the specimens examined by him. Seen in cross-section 
(d, fig. 3) it resembles very closely that of Fimbriaria and 
Duvalia as figured by Leitgeb.?. The root hairs, all of which are 
tuberculate, are found in this furrow. At the base of the recep- 
tacle these branch, one branch going to each lobe between the 
growing points. 
The archegonia, although they are on the underside of the 
receptacle, are in reality on the dorsal side, for they are formed 
actopetally just back of each apical cell. Hence there are five 
‘OWS or groups of archegonia (d, fig. 3). In each of these rows 
there are usually three or four archegonia. 
/ oh * development of the archegonium corresponds very closely 
aa ns of other Marchantiacee. The primary cell becomes 
arger than the neighboring cells, and. the cell contents 
ie meh denser, so that it stains very deeply. The first 
Ss a 's transverse. The outer cell forms the archegonium 
dis ies, the Stalk. Strasburger® states that in Marchantia 
‘t. Ms hi 1S again divided by a wall parallel to the first, and 
Ze Sse cell of the two thus formed forms the foot of the 
1. Janczewski? describes the same thing in Prezssia 
This second division does not take place in Crypto- 
Mowe, M.A.: Erythea 5: 87, 
Oy, 88. 1897. 
. MEITCER: 
ae Untersuchungen iiber die Lebermoose 6: PL. 4s AES. Js 20+ 
ASBURGER : Jahrb. f. wiss, Bot. 7: 416. 
SJax 
CZEWSKI: Bot. Zeit.— : 418, 1872. 
