16 46 Proceedings of the Royal Irish Academy. 



Associations of Algae. 



Associated with Oedogonium Braunii as the dominant feature in one pool 

 in Clare Island were: — Pediastrum tetras in great abundance, Coelastrum 

 sphdericum frequent, Lyngbya Rivulariarvm mostly clinging to and around 

 the Oedogonium, Anabaena inaequalis mostly agglutinated to the Oedogonium 

 by its sheath, and various forms of Scenedesmus quadricauda with Tetrapedia 

 reinschiana. Mixed up with the rest, but in much smaller quantity, were: — 

 Scenedesmus obliquus, S. acutiformis v. brasiliensis, Pediastrum boryanum 

 v. productum, Tetracdron caudatum, Ankistrodesm/us falcatus, Merismopaedia, 

 tenuissima, Dactyl 'ococcopsis fascicularis v. subrecto, Staurastrum pundidatum 

 var. pygmaeum, Gosmarimn laeir var. octangularis, 0. hvmile, C. Mcneghinii, 

 C. punctulatum var. subpwictulatwm,. 



In a pool near the light-house on Clare Island the following were 

 in a mixed association with Sphagnum cuspidatwm and A svbsecundum : — 

 Sremosph-aera viridis, Ulotliri.r variabilis, Chlorobotrys reyularis, Ophioeytium 

 cochleare, Botryococcus Braunii, Astcrococcus superbm, Scenedesmus bijugatus, 

 DimorphococcvM lunatus, Schizochlamys delicatida, Microthamnion kuetzingianuni, 

 Glenodinium cinctum, Ch roococevs minor, Nostoc microseopicum, Navicida viridis, 

 N. Tdbellaria, Vanheurclia rhomboides v. saxonica, Netrium Digitus, Closterium 

 Lunula, C. Cynthia, C. calosporum, C. turgidmu, Eaastrum bidentatu/m, E. 

 elegans, E. Didelta, E. binalc, Micrasterias apiculata, v. fimbriate/,, 31. angidosa, 

 M. rotata, Cosmarium angulosum v. concinnium, C. Gucumis, C. Brebissonii, C. 

 difficile v. laevc, Xanthidium antilopaeum, Tetmemorusgranulatus, T. Brebissonii, 

 Staurastrum margaritaccum, S. aciculiferum, S. polymorphum, S. hirsutum, 

 Desmidium cylindricum, Hyalotheca dissiliens, &c. 



An association in a small pool on the top of Croaghmore, Clare Island, at 

 about 1,500 feet elevation, contained as the main feature Chroococcus turgid 'us; 

 in much smaller quantity were G. macrococcus and C. pallidas'. Tribonema 

 bomdycina was also in quantity ; the rest consisted of Vanheurckia rhomboides 

 v. saxonica, V. vulgaris, Navicula viridis, Gloeocystis vesiculosa, G. rupestris, 

 Aphanocapsa testacea, Mesotaenium macrococcum v. micrococcum, Euastrum 

 binale v. Gutioinskii, Cosmariv/m Cucurbita, G. sphagnicolnm, Staurastrtnu 

 margaritaccum, S. Avicida v. subarcuatum, &c. 



Another association from a pond of fairly aerated water near the hotel, 

 Clare Island, was chiefly Rhizoclonium Meroglyphicum and Cladoplwra 

 flavescens, amongst which were UJothric variabilis, Myxonema nanum, Lyngbya 

 Bivulariarum, Gharacium Prinysheimii epiphytic on a sterile Oedogonium, 



