80 SEA MOSSES. 



vcsscb in ihc cxlrcmilics of ih^ branches, which arc, 

 in thai case, mm h swollen, an»I of a prommnc cd 

 yellow color. Cut throti-h with a knifo. these swollen 

 rcccpinrlcs will apjK-ar to consist of a mass of hard 

 gelatine, and the scc<l vessels will show themselves as 

 bright yellow spots, all arotind ih*- rirmmference. 'I"hc 

 distinct olive green colcjr of the fresh pbnl changes 

 to bla< k in drxing. 



Kiirs NoiKisfs, K 



Our next niost common " Ro<kweed." is the 

 "knotty" /'u.ut, so called, from the kno: H- 



ings which the interior air vessels make in the frond. 

 'Hiis sjjccics difTers fmm the last in scvem: -r- 



tant respects: f.rst. by having a very narrow frond, 

 of the same widih throughout. one-.|uarter of an in< h 

 or more; sicond. by its method of branching, 

 which is not in reguhr forks, but by ptitting out side 

 branches of various and irregtiLir lengths, commonly 

 quite long, from the sides of the main stem ; thini, by 

 the presence also with the branches of short (three- 

 quarters to one inch long) bram hlets, whose wider 

 ends thicken and produce the seed vessels ; and fourth, 

 by the prominent swellings or knots in the Mem. and 

 branches whic h give the sjKxies its name. , and 

 the other Fua are (listened to the rock on uhirh ihey 



