15 100 Proceedings of the Mogul Irish Academy. 



Polysiphonia faatigiata Grev. — 01/; CB, AS, ab. See note. 



atro-rubescens Grev. — CI r, CB ab. 



nigrescens Grev. — CB, AS, c. 



Brodiaei Grev.—c. 



subulifera Harv. — CB, AS, /. See note. 



fruticulosa Sprang.— c. 

 Pterosiphonia parasitica Schm. — /. In deep pools and in sub-littoral region. 



thuyoides Schmitz. — CI/, Roonali ab. 

 Brongniartella byssoides Bory. — CB ab. 

 ;: Dasya eorymbifera Cru. — CB r. Dredged in 5 fathoms, and washed ashore. 



arbuscula Ag. — CI/, Bellacragher Bay r. See note. 

 Heterosiphonia coceinea Falk. — f. 

 Spondylothamnion multifidum Nag. — CI r, CB/. 

 Spermothamnion Turneri, Aresch. — CI/, Old Head ab. 

 \ var. subverticillatum, comb. nov. — CB/ See note. 



Ptilothamnion pluma Tfmr. — CI, CB, /. On stipes of Laminaria Gloustoni. 

 \- lucifugum sjp. nov. — CI r. See note. 

 Griffithsia corallina Ag. — CB, AS, ab. See note. 



setacea Ag. — CI r, CB/. 

 Halurus equisetifolius Kiltz. — /. 



:: Bornetia secundiflora Thur. — CI very rare. See note. 



Monospora pedicellata Sol. — CI r, CB./'. In rock-pools and in sub-littoral region. 

 Rhodochorton membranaceum Magn. — CB r. 



Rothii^Va^. — CI /, Roonah / In shady situations only. 



parasiticum Batt. — f. On stipes of Laminaria Gloustoni. 



floridulum Nag. — ab. 

 Callithamnion byssoides Am. — CB, AS, ;•. See note. 



polyspermum Ag. — /. 



scopulorum Ag.— CI / See note. 



roseum Harv. — AS, BB, /'. 



[tripinnatum Agardh.] — Roundstone/ (coll. McCalla). 



Hookeri Ag. — CI c. On Gladostephus spongiosus. 



arbuscula Lyngb. — CI c. On steep exposed rocks. See note. 



tetragonum Ag. — CI r. On blades of Laminaria digitata. 



coryuibosuni Lyngb. — CB, AS, c. See note. 



granulatum Ag. — CI r. See note. 

 Seirospora Griffithsiana Harv. — AS r. 

 * hormocapa Batt. — AS very rare. 

 [Compsothamnion thuyoides Schm.] — Roundstone (coll. McCalla). 

 Plumaria elegans Schm. — c. 



Ptilota plumosa Ag. — c. On stipes of Laminaria Gloustoni. See note. 

 Antithamnion cruciatum \ag. — CI very rare. On vertical rocks near low-water. 



