. Journal of botany, British and foreign . g. ^pora, var. n. form as a distmct , vegetative cell; B, zygospore, Var. SPH^ROSPORA, var. n. (Fig. 1). X 500. Var. cellulis parvis et brevibus; zygo- sporis subglobosis vel ellipsoideo-glo-bosis. Long. cell. 48-66 /a, lat. 8-8-5 /x; lat. apic. 3-4 /x ; 23-5-26 /x. Hah. Earlswood, Warwickshire, March, 1910. 3. Pleurococcus rufescens (Kiitz.) Breb. This species ofPleurococcus is exceedingly rare in the British Islands. In October,1907, Mr. W. B. Grove collected very fine specimens attached towood in a rain-water tank at Be
. Journal of botany, British and foreign . g. ^pora, var. n. form as a distmct , vegetative cell; B, zygospore, Var. SPH^ROSPORA, var. n. (Fig. 1). X 500. Var. cellulis parvis et brevibus; zygo- sporis subglobosis vel ellipsoideo-glo-bosis. Long. cell. 48-66 /a, lat. 8-8-5 /x; lat. apic. 3-4 /x ; 23-5-26 /x. Hah. Earlswood, Warwickshire, March, 1910. 3. Pleurococcus rufescens (Kiitz.) Breb. This species ofPleurococcus is exceedingly rare in the British Islands. In October,1907, Mr. W. B. Grove collected very fine specimens attached towood in a rain-water tank at Bewdley, in Worcestershire. 11-5-17 /x. 4. Richteriella botryoides (Schmidle) Lemm. in Hedwigia,xxxvii. 1898, p. 306, t. 10, f. 1-6. This limnetic Alga occurred insmall quantity associated with Actinastrum Hantzschii in thesurface waters of the canal at Lifford, Worcestershire, in October,1910. It is quite possible that this and other allied Algae are. ALGOLOGICAL NOTES 85 widely distributed in the British Islands, but up to the presentthis is only the third record of the occurrence of Bichteriellahotryoides. 5. Lagerheimia wratislawiensis Schroder in Bar. Ges. 1897, xv. p. 373, t. 17, f. 7. This Alga occurred sparinglyamong numerous members of the Protococcales in a small pool inthe grounds of Studley Castle, Warwickshire, in October, is, perhaps, the most distinctive species of the genus, and thisis the first British record. In no single instance did the parietalchloroplast possess a pyrenoid, and, therefore, after comparisonwith Schroders original description and figure, this must beregarded as additional evidence that the presence or absence ofpyrenoids in the chloroplasts of the Protococcales is largely aquestion of nutrition. Long. cell. 12 /x, lat. cell. 9 /x; long. fx. (Fig. 2, G.) 6. Lagerheimia genevense Chodat in Nuova Notarisia, 1895,p. 87, f. 1-12. This minute Alga of the subfamily PhytJie
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