248 CRYPTOGAMIA 



153. ASPEROCOCCUS. 



1. A. echinatus, frond tubular, membranous, olive or brownish 

 green, somewhat transparent, even, attenuated at the base, about 

 one foot in length. GREV. Alg. Brit. 50. Ulva fistulosa, HOOK. 

 Scot. ii. 92. Fistularia attenuata, GREV. Fl. Edin. 300. Encoe- 

 lium Lyngbyanum, GREV. Crypt. Fl. t. 290. 



Hab. Common on our wet shores attached to rocks. 



154. PUNCTARIA. 



1. P. plantaginea, frond olive-brown, thin, lanceolate or linear- 

 lanceolate, attenuated at the base, more or less waved, entire, 

 dotted GREV. Alg. Brit. 53. Ulva plantaginea^ WITH. iv. 136. 

 {7. plantaginifolia, GREV. Fl. Edin. 299. 



Hab. On wet rocks in the bay below the Magdalen fields., 

 abundant. Spring. Q 



Fronds tufted, about 6 inches long, generally roughened with 

 young parasitical confervae, or flocculent sordes. 



155. ZONAUIA. 



1. Z. deusta, dark olive-green, coriaceous, circular, entire, ob- 

 scurely zoned, adnate, bullate in the centre. SPRENG. Syst. Vey. 

 iv. 327. 



Hab. On slaty and sandstone rocks near high water mark 

 in Berwick Bay. If. 



Adheres closely to the rock, and spreads in a circular manner, 

 but often rendered irregular by the inequalities of the 

 surface beneath. I have seen a single frond fully a span 

 in diameter, but generally it is much less. Upper surface 

 smooth, somewhat waved, tubercular or bullate in the 

 centre, blackish -green, and more or less distinctly zoned. 

 Under surface brown, naked. Texture coriaceous, firm, 

 opake, rather brittle. The central part often dies away 

 and falls out, leaving the circumference in the form of a 

 circular band. Dr GREVILLE in a letter to me concern- 

 ing this plant, says, u Zonaria deusta has a reddish colour 

 which yours has not, and a corrugated burnt appearance, 

 which yours has in a much less degree. I think that your 

 plant may turn out to be my Padina parvula (Zonaria par- 



