SPECIES OF CALLOPHYLLIS AND BH0DYMENIA. 83 



probably from this procarp originate the fertile cell-rows of the 

 gonimoblast. I could not discover exactly at what stage of 

 the development these cell-rows begin, but they appear already 

 in an early state of the fruit, when the swelling is comparatively 

 small. These fertile cell-rows grow as thin filaments through the 

 interstitial tissue between the large cells of the young fruit- 

 nucleus, and form, with these interstitial cells and rhizoids, a 

 compact filamentous interweaving. In this tissue the fertile cell- 

 rows are nourished at the expense of these interstitial cells, 

 which are often not easily distinguishable from the cells of the 

 fertile cell-rows. 



During the formation of this filamentous tissue the whole 

 nucleus increases gradually, and assumes a more or less thick 

 lens-shaped form. This nucleus shows innumerable interwoven 

 slender filaments, and, scattered through them, the whole me- 

 dullary cells sometimes a little compressed. 



In this increasing filamentous tissue at different points small 

 cavities appear by unequal extension. These spaces are quite 

 irregular in size, and are bounded on all sides by a compact wall 

 of filamentous tissue. From the side of the spaces spring nume- 

 rous short lateral branches of these filaments, which either 

 remain undivided or are branched dichotomously. At the apex 

 of these branches the cells form clusters of small cells of various 



si 



i 



apes 



These clusters * are composed of from four to seven cells each, 

 sometimes more, which lie close together arranged in different 

 ways. In a later stage of the fruit they become fully developed 



spores. 



The number of these fertile branches in a single space is 

 variable, and therefore the size of the spaces differs also. 



The spore-forming clusters of each space are almost always 

 in the same state of development. The cells of these clusters 

 gradually develop into spores, and then all the clusters are con- 

 glomerated into a single glomerule. All the glomerules of a 

 fruit-nucleus are also always in the same state of development ; 



Naegeli ('Neuere Algensysteme,' p. 239) has already described the dere- 

 lopment of these clusters in Callophyllis laciniata. From his description, the 

 single cluster always grows with a two-edged apex-cell from which are cut off, 

 alternately to right and left, segment-cells. The clusters of the above-ment ioned 

 specimn of Callophyllis obtusifolia are certainly not propagated in such a 

 regular manner, and the apex-cell is also not two-edged. 



LINK. JOUIiN. — BOTANY, VOL. XXIX. H 



