APPENDIX OE NEW SPECIES 



DISCOVERED SINCE THE PUBLICATION OF THE ^^PHYCOLOGIA 



BEITANNICA." 



OLIVE GROUP. 

 Family I. FUCACE^. 



FUCODIUM ANCEPS. 



Colour. When fresh, olive green. 

 Substance. Tough and leathery. 



Character of Frond. Compressed, slender, branched. Branchlets forked {dicfiotomous) . 

 Measurement. Four or 5 inches long. 

 Air-vessels. None observed. 



Fructification. Minute seeds (spores) in special receptacles, forming long, narrow 



pod-like forks at the tips of the branchlets. 

 Habitat. Only found as yet on a rock at Kilkee, Co. Clare. 



This was Dr. Harvey's last discovery in 1863, of which the reader must for 

 the present accept an unscientific description. The long, narrow, pod-like 

 receptacles standing upright in pairs at the ends of the branchlets, distinguish 

 this Fucodium from all the others. 



Family IL SPOROCHNACEJ:. 



DESMARESTIA DRESNAH. 



Colour. Pale brown, becoming a pleasant olive-green when dry. 



Substance. Firmly membranaceous; somewhat horny when fresh; never becoming very 

 soft. 



Character of Frond. Flat, leaf-like, with an evident but thin midrib throughout, 

 and side veins; margins slightly indented. When perfect, oppositely hraiiched 

 (if the phrase be allowed) with leaf-like fronds of the same character: the whole 

 plant consisting of leafy formations, springing from each other. 



Measurement. Specimen in Trinity College Herbarium (Dnblin), 10 inches long by 

 2 wide. But Mr. Sawers describes others as 18 inches long, breadth 3. 



Fructification. Not ascertained. 



Habitat. Moville Bay, Co. Donegal, 1853. Mr. W. Sawers. 



By Agardh, and also by Dr. Harvey, this plant is considered as only an ex- 

 travagantly wide form of D. ligulata; but no one who has not seen intermediate 

 specimens can easily believe this. Yet, in the tapering to both ends of the 

 so-called branches of the common forms of D. ligulata, a tendency to leaf-like 

 formation may be observed; the branchlets especially, resembling small ribless 

 leaves. On the other hand, the "obscure midrib towards the base" of D. ligulata 

 indicates an inclination to that formation also. Any one interested in the 

 subject will find the growth of JDesmarestia described in Dr. Harvey's Nereis 

 Boreali- Americana, vol. i. p. 77. 

 87 . * N 



