16 



CLASSIFICATION OF AMERICAN ALGjE, 



ACCORDING TO PROF. HARVEY'S MOST RECENT WORKS. 



Series I. 

 MELANOSPERMEiE, or OLIVE-COLORED ALG.E. 



All the Melanosperms are marine, of olive color. Spores olive, 

 either external or in proper receptacles. The Melanosperms com- 

 prize six orders, namely — 



1. FuCACE^J. - 4. DfCTYOTACE^E. 



2. SpoROCHNACE^E. 5. CuORDARt ACE.fi. 



3. Laminariace^:. 6. EctocarpacejE. 



Order I.— FUCACE.E. 



Frond inarticulate ; leathery or membranaceous. Spores im- 

 mersed in the frond. The Fucaceae contains five genera, namely— 

 I. Sargassum. III. Cystoseria. 



II. Hahdrys. IV. Fucus. 



V. Himanthalia. 



I. Sargassum. Agardh. 



Distinct, stalked, nerved leaves, and simple stalked air-vessels. 

 Conceptacles spherical, containing spores and tufted antheridia, com- 

 municating through numerous pores to axillary clusters in small 

 linear receptacles. 



S. vulgare, Agardh ; Greenpoit, L. I. 



S. bacciferurn, Turner ; New York and Massachusetts Bays. 



8. Montugnei, Bailey ; Long Island Sound. 



II. Halidrys, or Sea Oak. Lynbye. 

 Frond compressed, pinnated wiih branches. Air vessels stalked, 

 lanceolate, leafless. Receptacles stalked, terminal. 

 H. Siltquosa, Lynbye. ; Stoninglon. 



I If. Cystoseira. Ag. — Name, a chain of bladders. 



Frond much branched and bushy. Branches very slender, and 

 containing chains of air-vessels immersed in the substance of ihe 

 plant- Receptacles terminal. 



U. ericoides, Goodwin and Woodward ; Florida. 



