100 PLANTS FOB THE 



well In an Aquarium when about eight inches in length 

 and has somewhat the appearance of a narrow ulva. 



JBryopsis plumosa, or feathery moss, as its name desig- 

 nates, is a beautiful plant both in form and color, not 

 being of so yellow a shade of green as the Ulva or En- 

 teromorpha, but of a colder color, and standing up in the 

 water like an accumulation of feathers. It is found pretty 

 plentifully upon some of the rocky parts of the coast of the 

 United States, growing cither in the open water or skirt- 

 ing the many pools left by the receding tide. When dried 

 on paper, it adheres well and appears of a rich glossy 

 green. It is an excellent aerator of the water, its many 

 brandies appearing in the sunshine covered with minute 

 bubbles of oxygen, which they entangle and arrest in 

 their upward passage and hold until the gas is consi- 

 derably dissolved in the water. It looks well when a 

 bunch is placed on some high projecting portion of the 

 rockwork, where, when the sun is obscured, it remains 

 hanging down ; but, as soon as it feels his light, stands 

 up in an assemblage of seemingly minute pine trees. 



Cladophora arrfa and llupeslris resemble very much, espe- 

 cially the last, fine varieties of IJryopsis, and are recommended 

 by naturalists for use in the Aquarium. From being green 

 alga^, they can with safety be introduced into the tank, 

 as we can soon find out whether they thrive. Both these 

 two species and llnjopsis pkimosa arc generally covered 

 with smaller algse of the family ZHatomacea and, therefore, 

 present a rich harvest to the microseopist. Cladophora 

 rupestris is very common on the rocky points of our 

 coast. To show how nature has arranged these plants so 



