THE MARINE BOTANIST. 157 



DELESSERIA. 



Named in honour of M. Benj. Delessert, a distinguished 

 French Naturalist and patron of Botany. 



Frond rose-red, flat, membranaceous, with a per- 



current midrib. Fructification of two kinds, on 



distinct individuals: — 1. Hemispherical tubercles 



(coccidia), mostly on the midrib, containing* a tuft 



of filaments bearing the spores. 2. Tetraspores 



forming definite spots in the frond, or in distinct 



leaf-like processes. 



DELESSERIA SANGUINEA.— RED DOCK- 

 LEAVED DELESSERIA. 



Stem cartilaginous, bearing beautiful, large, rich 

 rose-red fronds, in shape and colour like the leaves 

 of the Red Dock (Rumex sanguineus), and 

 veined like those of the Spanish chestnut. In the 

 summer the fronds are large, and with a waved 

 margin, smaller leaves often springing from the 

 midrib as the season advances. The winter state 

 presents a remarkable contrast, the membranaceous 



