166 



Fig. 80. 



Fiirrcllaria faslhjiaia. Adventilious 

 shoot in loiisitudiiKiI section. '.)5:1- 



though I have not observed it, but when Denvs says 

 that they "schliessen nach kiirzerem oder langei em Ver- 

 lauf an die inneren Zellen der mittleren Rinde" (1. c. p. 10) 

 he must have misinterpreted tlie facts observed. Wille's 

 statement (1887, p. 87) tliat Ihese cells "mit einander 

 sowohl als auch mit den Speicherungszellen durch Poren 

 in Verbindung treten" might be understood as if the pits 

 were secondary, whereas in reality they are primary. 

 Whether secondary pits may be formed between the 

 hyphae, or between these and other cells, I have not ob- 

 served. — In late summer, autumn and winter these 

 cells are rich in starch. As to the starch compare for 

 the rest Kolkwitz (1. c). All the vegetative cells contain 

 a single nucleus. Hairs are never produced. 



As to the stolons reference may be made to the 

 descriptive works and to Kolkwitz (1. c. p. 46) and Denys (1. c. p. 8). 



The erect fronds are, as is well known, branched by dichotomy, but besides 

 this normal ramification adventitious branches sometimes occur, especially in the 

 inner Danish waters (Sa, Sf, SI), Sii, Bw) (Flor. Dan. tab. 393). They originate from 

 a little group of superlicial cells. In developing they increase early in thickness so 

 that their basal plane is much larger than their plane of insertion (fig. 80). They 

 may be very mumerous, as for instance in some specimens dredged in January in 

 Store Bell (NU, no. 4250) at 11 meters deplh, the shoots of which were, for a length 

 of one to three cm or longer, more or less densely beset with very short adven- 

 titious shoots; some older shoots of this kind had 

 again produced adventitious buds. The cause deter- 

 mining the appearance of these shoots is unknown; 

 the plants producing them may be fertile. Another 

 sort of adventitious shoots develop from the scars 

 arising from the decaying and falling off of the 

 fructifying parts of the shoots (fig. 81, comp. Harvey, 

 Phyc. Brit. Plate 94). As shown 

 by Caspary (1. c. p. 93, fig. 10) 

 this regeneration can be once 

 or twice repeated. 



The reproductive organs 

 are produced in the upper part 

 of the fronds; their develop- 

 ment begins at the end of the 

 summer or in the beginning of 

 the autumn. In August very 

 young sporangia may be found 



Fig. 81. 



Fiirccllaria fastir/iala. 

 Adventitious shoots grow- 

 ing out from scars. Hirs- 

 lials June. 1,5 : 1. 



Fig. 82. 



Fiirccllaria fasligiata. A. young sporangia 

 in transverse seclion of frond, August. 220:1. 

 B, ripe sporangium. 230:1. 



