DictyotecE?\ punctaria. 145 



are marked, at spaces of half a line asunder, witli trans- 

 verse rings of spores. 



Genus XXII. PUNCTAEIA, Greville. 



Gen. Char. Frond simple, membranaceouSj flat, with a naked 

 scutate root. Fructification scattered over the whole frond in 

 minute distant spots, composed of roundish prominent seeds, 

 intermixed with club-shaped filaments. — The name is from 

 pimctum, a dot ; the fruit being in dots scattered over the surface 

 of the frond. — Greville. 



1. PuNCTAUiA LATiFOLiA, GfeviUe. (Plate IV. fig. 16.) 

 Hab. On rocks in the sea. Annual. April .and May. 



Pound by Mrs. Griffiths at Torquay ; Dr. Drummond, near 



Belfast ; Professor Harvey, west of Ireland. 



We have found it very large in the island of Arran in 



the month of June, when the broad pale fronds were partly 



decomposed. The colour of the frond is pale olive-green, 



tender, suddenly tapering at the base. 



2. PUNCTARIA PLANTAGINEA, GrevllU. 



Hab. On rocks and other Algse. Pound by Mr. Turner 

 at Cromer ; Dr. Drummond, Belfast ; Dr. Greville, Frith of 

 Forth. It is found during summer at Saltcoats. 



So late as the month of September I found it cast out on 



L 



