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Eleven species of Aecidium are recorded here; of these, nine are endemic and two indigenous. Key to the Form-species of Aecidium. Host belonging to the family Ranunculaceae.   Aecidia on large distorted areas 1. A. otagense.   Aecidia in small groups, not on distorted areas 2. A. Ranunculacearum. Host belonging to the family Leguminosae 3. A. kowhai. Host belonging to the family Tiliaceae 4. A. Milleri. Host belonging to the family Myoporaceae 5. A. Myopori. Host belonging to the family Plantaginaceae 6. A. Plantaginis-variae. Host belonging to the family Rubiaceae 7. A. hupiro. Host belonging to the family Compositae.   Epispore minutely verruculose.    Aecidia crowded in distorted areas 11. A. Macrodontae.    Aecidia scattered 9. A. Celmisiae-petiolatae.   Epispore covered with deciduous tubercules.    Spores obovate or elliptical 8. A. Celmisiae-discoloris.    Spores elongate-elliptical 10. A. Celmisiae-Petriei. 1. Aecidium otagense Lindsay. (Fig. 102.)  Ranunculaceae. Linda., Trans. Roy. Soc. Edinb., vol. 24, p. 430, 1866. 0. Spermogones associated with the aecidia, immersed, honey-coloured. I. Aecidia amphigenous, caulicolous, petiolicolous and sepalicolous, crowded in inflated distorted areas which may attain a length of 15 cm., orange. Peridia cupulate, shortly erumpent, 0.5–1 mm. diam., margins revolute, yellow, deeply and irregularly lacerate. Spores globose or polygonal, 23–36 mmm. diam.; epispore hyaline, delicately and closely verruculose, 0.75 mmm. thick, cell-contents granular, orange. Hosts :— Clematis indivisa Willd. On leaves, stems, petioles, and sepals Herb. Nos. 188, 434. Lake Horowhenua, Levin (Wellington), 30 m., E. H. Atkinson! 26 Oct., 1919. Peel Forest (Canterbury), H. H. Allan! 8 Nov., 1919. Manawatu Gorge (Wellington), 150 m., J. W. Whelan! 29 Sept., 1921. Putara, Eketahuna (Wairarapa), H. Watson! 8 Nov., 1921. Clematis Colensoi Hook. f. On stems and petioles. Herb. No. 231. Miramar (Wellington), 20 m., J. W. Bird! 5 Nov., 1920. Distribution: Endemic; common throughout. The hosts are endemic, and are abundant throughout. (Cheeseman, 1906, pp. 2, 3.) This rust forms conspicuous distorted areas, many centimetres long, on the stems and leaves of the hosts. The mycelium is perennial, so that once a plant has become infected the rust appears season after season. The specimens on Clematis Colensoi are badly infected with Tuberculina persicina (Ditm.) Sacc. (see Appendix, p. 50). Lindsay records the rust upon Clematis hexasepala DC. The aecidia of this species are formed within the host-tissues in the vicinity of the phloem, and all stages may be obtained from immature to fully-developed peridia containing numerous spores. As they develop, the peridia move towards the periphery of the stem, and prior to dehiscence may be found fully developed lying beneath the epidermis. That they are mature is evidenced by the behaviour of the spores, for on being placed in water these give rise to infection hyphae.

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