NOTES ON SCOTCH FRESH-WATER ALGE. BY WILLIAM WEST, F.L.S. (PLATE 333). DURING a short botanical tour about some of the mountains of Scotland, in July, 1889, I made a large number of gatherings of Algæ; I had also collected some in August, 1880; Mr. J. McAndrew, of New Galloway, collected certain plants at my request, the washings from which were rich; and Mr. E. Naylor, of Bradford, made a gathering in the Orkneys. An examination of these collections has resulted in a fair list of species, many of them not having been recorded before as British. During the preparation of this list, I ascertained that Mr. J. Roy, of Aberdeen, was preparing a list of the Desmids of Scotland; I therefore handed over to him a list of those I had noted, about 200 in number, several of which were new species; most of the remainder I learnt had been observed from Scotland before by Mr. Roy. Washings and squeezings of Myriophyllum, Hypnum trifarium, H. scorpioides, Sphagnum contortum, Nardia emarginata, and similar aquatic plants were prolific in the smaller species. Some of the gatherings were made at elevations of above 3000 ft., and the majority were made among the hills at altitudes between 1000 and 3000 ft. Those species that are hitherto unrecorded for Britain are prefixed by an asterisk. Those species that were observed from all or nearly all the localities visited are marked frequent. My son, G. S. West, has been of the greatest assistance to me during the preparation of this paper, and the plate is entirely his work. As the following names of localities are of frequent occurrence, they are contracted as follows: Craig-an-Lochan. Gm. = Glas Maol. I.-ALGE. Class Confervoidea Heterogameæ. Ord. EDOGONIACEÆ. Edogonium Itzigsohnii De Bary, var. MINOR, nov. var. Var cum cellulis angustioribus et oosporis minoribus. Crass. cell. veget. 6–6.5 μ; altit. 8-11 plo major; crass. oogon. 30 μ; altit. 28-30 μ; crass oospor. 18-20 μ; altit. 18-20 μ. Orkney Is. E. platygynum Wittr. S. E. sp. Aberdeen. Crass. cell. veget. 10-12.5 μ; altit. 6-7 plo major; crass. oogon. 24 μ; altit. 40 μ; crass. oospor. 20 μ; altit. 30 μ. JOURNAL OF BOTANY.--VOL. 81. [APRIL, 1893.] H Class Confervoidea Isogama. Ord. CONFERVACEÆ. Conferva pachyderma Wille. N., Orkney Is. C. bombycina Ag., f. genuina Wille. B., Ben Nevis, Ben McDhui, Aberdeen. f. minor Wille. B., C., Gm., Ben Nevis, Orkney Is. C. floccosa (Vauch.) Ag. Orkney Is. C. Raciborskii Gutw. (La Nuova Notarisia, 5 Aprilo, 1892, p. 17). S., N. Perhaps this species may be but a large form of C. Löfgrenii Nordst. (Alg. Exsic. No. 421, p. 17), but the specimens examined are nearer the plant described by Gutwinski. Lat. 24-25 μ; crass. membr. 4-5 μ. Fig. 9. Cladophora glomerata (L.) Kütz. S., Glen Lochaidh. D. plumosa (Vauch.) Ag. Glen Lochaidh. Ord. ULOTRICHACEÆ. Hormiscia zonata (Web. et Mohr.) Aresch. T. Ulothrix tenerrima Kütz. M. Class Conjugatæ. Ord. MESOCARPEÆ. Mougeotia nummuloides (Hass.). B. Crass. cell. veget. 13.515 μ; diam. spor. 28-37 μ. *M. gelatinosa Wittr. in Wittr. et Nord. Alg. Exsic. No. 957, p. 26. Crass. cell. veget. 15-16.5 μ; long spor. 42-47μ; lat. spor. 33-36 μ. Glen Lochaidh. M. recurva (Hass.), var SCOTICA, nov. var. Fig. 1. Var. paullo major, canalibus copulationis multe inflatis. Crass. cell. veget. 17.5-21 μ; diam. spor. 25-28 μ. Glen Tummel. The conjugating canal is distinctly visible all round the spore, as in M. Minnesotensis Wolle and M. divaricata Wolle. Ord. ZYGNEMACEÆ. Spirogyra varians (Hass.) Kütz. G. Crass. cell. veget. 30 μ; long zygosp. 50–56 μ; lat. zygosp. 34-36 μ. Zygnema sp. (ster.). Killin. Crass. cell. veget. 20–24 μ; long 1-4-plo major. Several attempts at lateral conjugation were seen, but no mature zygospores. Z. sp. (ster.). C. Crass. cell. veget. 25-26 μ; long 14-plo major. Z. sp. (ster.). C., B. Crass. cell. veget. 33-37 μ; long 1-11plo major. Class Canobieæ. Ord. PANDORINEÆ. Pandorina morum Müll. C. Ord. PEDIASTREÆ. Pediastrum angulosum (Ehrnb.) Menegh. N. P. Boryanum (Turp.) Menegh. B., S., Aberdeen.-Var. granulatum (Kütz.) A. Braun. C., S. P. bidentulum A. Braun. Aberdeen. P. duplex Meyen. (P. pertusum Kütz.). C., S. P. tetras (Ehrnb.) Ralfs. S. P. tricornutum Borge (Chloroph fran Norska Finmarken. p. 4, f. 3). Diam. cœnob. 37-40 μ; diam. cell. 18-15 μ. Glen Tummel (1880). Fig. 2. P. integrum Näg. B. Fig. 4. *P. Sturmii Reinsch (Die Algenflora mitt. Theil. von Franken, p. 90, taf. 7, f. 1). Forma aculeis brevioribus. Diam. cœnob. (c. acul.) 52 μ; diam. cell. 10 μ. Fig. 3. Ben Laoigh. Ord. SORASTREÆ. Sorastrum spinulosum Näg. M. Staurogenia rectangularis (Näg.) A. Br. S. Long. cell. 5–7·5 μ; lat. cell. 3.5-6 μ. Calastrum sphæricum Nag. Aberdeen. C. cambricum Arch. cell. 19 p. Fig. 14. var. Aberdeen. Diam. cœnob. 42-50 μ; diam. C. microporum Näg. S. C. cubicum Näg. Aberdeen. II. PROTOPHYTA. Class Protococcoidea. Ord. EREMOBIEÆ. Ophiocytium cochleare (Eichw.) A. Br. N., Aberdeen. Dictyosphærium Ehrenbergianum Näg. C.Var. MINUTUM, nov. Figs. 16 & 17. Var. cellulis minutis globosis. Diam. cell. 3-3.4 μ. C. Nephrocytium Agardhianum Näg. S., M. N. Nägelii Grun. M., Glen Lochaidh. Oocystis solitaria Wittr. B., G., M., Orkney Is., Aberdeen. Long. 15-20 μ; 27.5-32.5 μ; lat. 9.5-11 μ; 18.5-17.5 μ. Fig. 12. O. Nägelii A. Br. S., Ben Chiurn. Long. 28-30 μ; lat. 17 μ. This is somewhat smaller than the published dimensions of this species, and may be 0. geminata Näg., which only appears to differ from the former in always being in pairs, and in its smaller size. In the specimens observed the cells were in pairs; we do not know of any published dimensions of 0. geminata Ñäg. O. apiculata, nov. sp. Figs. 7 et 8. O. in familias e 2-4 cellulis formatas consociatis, oblongis, diametro duplo longius, subapiculatis et incrassatis ad unumquemque polum. Long. cell. 11-15 μ; lat. cell. 5-6 μ; diam. fam. 2-cell. 22-24 μ. Orkney Is. The nearest species to this is 0. Nova Semlia Wille (Ferskv. Alg. fra Nov. Sem. p. 26, t. 12, f. 3 et 4); it differs in being rather more than twice as long as broad, and in its more oblong shape, with thickened pointed ends. Ord. PROTOCOCCACEE. Pleurococcus vulgaris Menegh. Ben Lawers, &c., common. Trochiscia paucispinosa, nov. sp. Fig. 5. T. parva, cellulis solitariis vel in familiis parvis associatis, subglobosis vel leve sub angularibus; membrana cellularum crassa, aciculis brevibus paucis (periphericis 7-14) ornata. Diam. sine acul. 15-17 μ; diam. cum acul. 18-20 μ; crass. membr. 1.5-2 μ. B. T. insignis (Reinsch) Hansg., f. minor. Orkney Is. Diam. cum proc. 28 μ. Chlorococcum gigas Grun. Frequent. C. frustulosum (Carm. ?) Rabh. B. C. humicola (Näg.) Rabh. C. Glæocystis ampla (Kütz.) Rabh. B., C., S. Orkney Is. Schizochlamys gelatinosa A. Br. B. Palmella mucosa Kütz. C. P. hyalina Bréb. S. Eremosphæra viridis De Bary. B., C., N., Glen Lochaidh. Urococcus insignis (Hass.) Kütz. N., Aberdeen, Orkney Is. Palmodactylon sp. S. The plant observed might have been referred to P. subramosum Näg., but the cells varied from subglobose to elliptical. Long. cell. 5-6 μ; lat. cell. 4-5 μ. Rhaphidium polymorphum Fres., var. aciculare (A. Br.) Rabh. S. -Var. falcatum (Corda) Rabh. B., S., C. *Geminella interrupta (Turp.) Lagerh. (Bidrag till Sveriges Alg. Flor. t. 1, figs. 1-35). Long. cell. 11-15.75 μ; lat. cell. 6-8.75 μ. Fig. 10. Glen Tummel. Scenedesmus bijugatus (Turp.) Kütz. C. S. alternans Reinsch. C. S. denticulatus Lagerh., var. linearis Hansg. (var. lineatus West). S., Ben Chiurn. *S. aculeolatus Reinsch., forma brevior. Fig. 13. Forma cum cellulis brevioribus quam forma typica. Long. cell. (c. spin.) 10 μ ; long. cell. (s. spin.) 8 μ; lat. cell. 5 p. C. S. quadricauda (Turp.) Bréb. B., C., Edinburgh Botanical Gardens. S. acutus Meyen. Frequent.-Var. obliquus (Turp.) Rabh. B., Tetraëdon minimum (A. Br.) Hansg. Aberdeen. T. enorme (Ralfs) Hansg. B. Class Phycochromacea. Sub-class Nostochinea. Ord. NOSTOCACEE. C. Nostoc Linckia (Roth) Bornet. A form with trichomes and heterocysts rather stouter than in the type. Diam. cell. 3.5–4·5 μ; diam. heterocyst. 6.5-7.5 μ. B. N. sphæricum Vauch. B., C. N. microscopicum Carm. (V. hyalinum Benn.). B. Anabæna sp. B. The material was insufficient for determination. The filaments were straight, with cells oblong, and one and a half times longer than broad; spores cylindrical, straight (or very slightly curved), with rounded ends. Črass, cell. 5 μ; long. spor. 40-46 μ; lat. spor. 12-14 μ. A. sp. Ben Laoigh. Crass. cell. 5.5-7 μ; crass. heterocyst. 10 μl. Ord. RIVULARIACEÆ. *Dichothrix Nordstedtii Born. et Flah. (Revision des Nostocacées Hétérocystées, Ann. des Scien. Natur. 7e sér. tom. 3, p. 374). Crass. fil. 12-15.5 μ; crass. trichiom. 6·5-8 μ. Fig. 11. B., T., Ben McDhui. On dripping alpine rocks. This species seems to be well marked by the total absence of heterocysts. Glæotrichia Pisum (Ag.) Thuret. Orkney Is. Crass. fil. 9–10 μ; crass. trich. 6 μ. Ord. SCYTONEMACEÆ. Tolypothrix distorta Kütz. Ben Chiurn. Crass. fil. 11.5-13 μ; crass. trich. 5-7.5 μ; crass. heterocyst. 6.5 μ. *Scytonema tolypotrichoides Kütz. B. Crass. fil. 15-16.5 μ; crass. trich. 10-11 μ; crass. heterocyst. 10 μ. Fig. 15. The cells were mostly subquadrate, but some of the younger specimens had the cells up to four times as long as broad, the heterocysts being very variable, and the younger sheaths constantly hyaline. S. figuratum Ag. Ben McDhui. Crass. fil. 20-23 μ; crass. trich. 5-7-5 ; heterocyst. 15-18 x 10 μ. This occurred mixed with Stigonema turfaceum Cooke. Ord. SIROSIPHONIACEÆ. Stigonema panniforme (Ag.) Born. et Flah. Glen Tummel. Ord. OSCILLARIACEÆ. Oscillaria Frölichii Kütz. B., Ben Laoigh. O. nigra Vauch. B., C., Ben Chiurn. O. tenuis Ag., var. viridis Kütz. B. O. leptotricha Kütz. C. O. tenerrima Kütz. S., C. Lyngbya inundata (Kütz.). C. Süb-class Chroococcacea. Ord. CHROоCOCCACEE. Chroococcus minor (Kütz.) Näg. B. C. pallidus (Nag.). Ben Chiurn. C. turgidus (Kütz.) Näg. Very frequent. C. cohærens Nag. C., Corrie Čeandor, Aberdeen. Glæocapsa polydermatica Kütz. B. G. rupestris Kütz. C. Synechococcus aruginosus Näg. B. Merismopedia glauca (Ehrnb.) Näg. S., C., Glen Tummel. M. irregulare Lagerh. S. Diam. cell. 2-2.5 μ. Aphanocapsa rivularis (Carm.) Rabh. B., Gm. A. Grevillei (Berk.) Rabh. Forma cum cellulis dispersioribus quam in forma typica. Lat. famil. 38-42 μ; lat. cell. 3 fb. Ben Chiurn. Microcystis protogenita (Bias.) Rabh. C., Glen Tummel. |