. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ERICACEAE 51 also some small flowei-beelles (Meligethes sp.) and 2 Muscids (Anthomyia sp., and Opomyza germinalionis /.). Scott-Elliot (Dumfriesshire), a humble-bee, a jMuscid, a micro-Lepidopterid, and a beetle (' Flora of Dumfriesshire,' p. 113). 1782. P. rotundifolia L. (Warming, op. cit., p. 124 ; Herm. Miiller, op. cit., p. 376; Lindman, ' Bidrag till Kanned. om Skandin. Fjellvaxt. Blomn. o. Befrukt.'; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.' pp. 102
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ERICACEAE 51 also some small flowei-beelles (Meligethes sp.) and 2 Muscids (Anthomyia sp., and Opomyza germinalionis /.). Scott-Elliot (Dumfriesshire), a humble-bee, a jMuscid, a micro-Lepidopterid, and a beetle (' Flora of Dumfriesshire,' p. 113). 1782. P. rotundifolia L. (Warming, op. cit., p. 124 ; Herm. Miiller, op. cit., p. 376; Lindman, ' Bidrag till Kanned. om Skandin. Fjellvaxt. Blomn. o. Befrukt.'; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.' pp. 102-3; Warnstorf, Schr. natw. Ver., Wernigerode, xi, 1896, p. 7.)âThe flowers of this species examined by me at Kiel \vere white in colour with an open bell-shaped corolla, devoid of nectar, feebl)' odorous, and homogamous (strongly protandrous according to Warnstorf. Their mechanism is at first adapted to crossing, and subsequently, as a rule, to automatic self-pollination. This change is brought about by a gradual alteration in the direction of growth of the style, which is at first directed almost vertically downwards, sometimes with a slight upward curve, so that the line of fall of the pollen is about 8 mm. in front of the stigma. The end of the style subsequently bends upwards, bringing the stigma vertically below the opening of the anthers, so that autogamy follows automatically by the fall of pollen (Fig. 231). Lindman says that in plants growing on the Dovrefjeld automatic self-pollination finally becomes possible, for the anther-pores, at first basal, are brought into a suitable position. In this species again the stigma secretes a large amount of sticky fluid, from which five conical elevations pro- ject, and the pores of the 3'ellow anthers are surrounded by an orange- â ,.-,.,- â¢^ ^ Fig. 231. Pyyola roUuidtfolia^ (trom natuiej. yellow band. Warnstorf states that the d) Stami-ns and pistil in tiie first condition of the ,, ^ . 1 â J- , flower; the stigma is
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