V. SPILEROCOCCOIDE.E. 105 



purple-red. Substance rigidly membranaceous. lu drying, it imperfectly adheres 

 to paper. 



The specimen examined accords very well with some of those from the west 

 coast of Ireland where this species abounds, and where it exhibits many variations 

 in breadth and ramification. It is easily recognised from all its congeners except 

 iV. Gmellni by the position of the sori. We have not perhaps sufficient data yet 

 to determine whether Hymenena fimhriata be anything more than an extravagant 

 variety of this plant, as I have sometimes supposed. 



VI. CALLIBLEPHARIS. Kiitz. 



Frond flat, cartilagineo-membranaceous, dichotomo-pinnate, often margined with 

 wing-like segments or ciliate, formed of two strata of cells ; the medullary cells 

 roundish-angular, longitudinal, of large size, in several rows ; the cortical minute, 

 coloured, in one or two rows. Conceptades sessile on the marginal processes, with 

 a thick pericarp, containing on an elevated basal placenta a dense tuft of fastigiate, 

 moniliform spore-threads forming ellipsoid spores from their upper articulations. 

 Tetraspores oblong, zonate, lodged in the peripheric cells of the frond (dispersed), 

 or of the marginal processes. 



Separated by Kiitzing from Rhodymenia^ on account of the very dissimilar struc- 

 ture of the conceptacular nucleus, and the zonate division of the tetraspores. This 

 last character distinguishes it from Gracilaria, from which also it differs by a 

 peculiar habit. The species are of a very deep and brilliant red while growing, 

 but become darker, sometimes almost black, in drying. Their substance is thicker 

 than that of most of the membranous plants of the Order. They are natives of the 

 Northern and Southern Oceans. 



1. CALLiBLEpnARis ciliitfa, Kiitz. ; root branching ; frond shortly stipitatc, thick, 

 subcartilaginous, dull-purplish red, lanceolate or forked, irregularly pinnated with 

 lanceolate or bifid segments, which are attenuated at the base ; the margin, and 

 often the disc, more or less furnished with subulate processes in which the con- 

 ceptades are lodged ; tetraspores collected in cloud-like patches, dispersed over 

 the lamina. Kii't:. ^p. Alg. p. 755. /. Ay. Sp. Alg. 2, p. G19. Rhodymenia ciliata, 

 Grev. Ilarv. Phyc. Brit. t. 127. Fxicus ciliatus, Turn. Hist. t. 70, fig. a — e. E. 

 Bot. t. IOG9. Var. 13. cirrhata ; frond very narrow, dichotoraous, the apices cirrhi- 

 form, repeatedly forked. 



Hab. Boston Bay, W. II. H. Var./3. dredged in Halifax Harbour, W.HH.iv. v.) 



VOL. IV. ART. 5. P 



