SYNOPSIS OF GENERA AND SPECIES OF HALVED. 15 



Conferva tortuosa Dillw. (Chatomorpha tortuosa J. Ag.). Abun- 

 dant on Alga? in high-water mark pools. — 0. Melagonium Web. et 

 Mohr. (Chaetomorpha Melagonium Kiitz.). Intermittent in its habit 

 of growth. Not uncommon at Mason's Cove, Steeple Rock, and 

 Breakwater. — C. Youngana Dillw. (Uluthrix isogona Thur.). On 

 Fucus vesiculosus and rocks near high-water mark. The outside of 

 Breakwater is fringed with this plant. 



Enteromorpha intestinalis Link ( Ulva Enteroniorpha Le Jolis, var.). 

 Abundant in most pools near high-water mark. A large supply of 

 water finds its way to the sea all round Arbroath, appearing as 

 springs dotted everywhere ; this will account for the large growths 

 of this plant as found at the Ness and Common. — E. compressa 

 Grev. (Ulva Enteromorpha Le Jolis, var.). Common on rocks and 

 stones everywhere. At the West Sands the Alga? about low-water 

 mark are always more or less covered. — E. clathrata J. Ag. On 

 Ceramium rubrum at Red Head. Not uncommon. 



Ulva latissima L. (Ulva lactuca L.). Common in tide-pools, and 

 on rocks and stones. — U. Linza L. (Ulva Enteromorpha Le Jolis, var.). 

 Common in most half-tide pools. 



Porphyra laciniata kg. Common between tide-marks on rocks, 

 and epiphytic on Alga3. The form umbilicalis also occurs. — 

 P. vulgaris Ag. Common on rocks, and in almost all pools above 

 and below half-tide level. — P. leucosticta Thuret. Growing on 

 Algre near low-water mark. 



Rivularia atra Roth. Common on Alga? in pools near high- 

 water mark. At Auchmithie, Red Head, Mason's Cove, &c. 



Calothrix confervicola Ag. Epiphytic on Alga?. Not uncommon. 



Lyngbya Carmichaelii Harv. {ULothrix flacca Thur.). Abundant 

 on Fucus vesiculosus above half- tide level from Ness to the Common. 



Dermocarpa incrustans Holmes MSS. (Spha;nosiphon incrustans 

 Reinsch). Parasitical on Polysiphonia. Mr. Holmes thinks it may 

 possibly be only a variety of D. prasina ; but the fronds are 

 narrower and more cylindrical than in that species, and correspond 

 exactly with Reinsch's figure. He has not met with fronds inter- 

 mediate in character. 



In conclusion, I take this opportunity of expressing my thanks 

 to Mr. Holmes for the assistance rendered me in the identification 

 of species, and the synonymy at present in general use. 



SYNOPSIS OF GENERA AND SPECIES OF MALVEJE. 



By Edmund G. Baker, F.L.S. 



There are few orders of which a general monograph is more 

 needed than Malvacecs. The last complete enumeration was that 

 of DeCandolle in the first volume of the ' Prodromus' in 1824, and 

 during the sixty-five years that have elapsed a very large number 

 of additional species have been described. In the present paper 

 I propose to attempt to bring together those belonging to the first 



