14 



Veit Brechek Wittrock. 



One of these deviations consists in the fact, that the passing of the 

 chlorophyll is begun and even completed without any previons enlarge- 

 ment of the upper part of the mother cell of the spore. The spore 

 formed in this manner is not cask-shaped, but cylindrical; with its top 

 rounded like a cone, if it is a terminal spore. Spores of this form are- 

 very often found in P. sumatrana (v. Mart.) nob. and in P. polymorpha 

 nob. (pi. 1, fig. 2 and 13), and not seldom in P. Zelleri (v. Mart.) nob. 

 and P. Roettleri (Roth) nob. They are more rare in P. Cleveana nob. 

 (pi. 2, fig. 13); and in P. mqualis nob. they would seem not to occur. — 

 The other deviation is, that not the whole ehlorophyllaceous contents of 

 the mother cell of the spore passes into the nascent spore, but a rather 

 considerable part of it remains in the subsporal cell. The chlorophylla- 

 ceous matter, which has remained in the subsporal cell after the for- 

 mation of the (first) spore, does not, however, continue in this cell, but 

 is used to form a new spore below the first. This is done in exactly 

 the same manner as in the formation of the first spore, only with the 

 difference, that the enlargement of that part of the cell which is in- 

 tended for a spore does not take place or is hardly perceptible. The 

 two spores that have been brought forth in this manner by the same 

 original mother cell, and which are placed beside each other, may be 

 called twin spores. Such twin spores are regularly found in the prin- 

 cipal filament (pi. 1, fig. 10, 11) and not seldom in the branches of the 

 l:st degree in P. Zelleri (v. Mart.) nob. (pi. 1, fig. 9 s' and s" } ). If 

 in this species the formation of the second spore fails in the principal 

 filament, the subsporal cell shows its creating power by forming instead 

 a normal branch near its top (pi. 1, fig. 9 sb). Accidentally, twin spores 

 occur in P. Cleveana nob. (pi. 2, fig. 14 and 15 s', ,s"), P. polymorplia 

 nob. (pi. 1, fig. 10), P. Roettleri (Roth) nob. (pi. 1, fig. 19, 20) and 

 now and then even in P. kewensis nob. (pi. 3, fig. 8 s', s"). In P. Cleveana 

 nob. I have even found, twice or thrice, three spores in a row, brought 

 forth by the same original mother cell (pi. 2, fig. 15 s\ s 2 ,. s s ). These 

 may, therefore, be called triple spores. — The third deviation from the 

 regular process of the spore formation is, that the mother cell of the 

 spore, mistaking, as it seems, the direction of the increase, forms the 



') In one case, represented pi. 2, fig. 10, I have found in this species one 

 more deviation: the lower of the twin spores, marked s", has, alter the protoplasm 

 has contracted, surrounded itself with a quite new membrane, instead of using that 

 of the 'mother cell as far as possible. 



