[Read before the Wellington Philosophical Society, 24th October, 1923; received by Editor, 31st December, 1923; issued separately, 30th July, 1924.]
Since Parts 1 and 2 of “The Uredinales, or Rust-fungi, of New Zealand” were published (Trans. N. Z. Inst., vol. 54, pp. 619–704; ibid., vol. 55, pp. 1–58, 1924) the following additional species and hosts have come to hand:—
0. Spermogones unknown.
III. Teleutosori on pods which have become converted into distorted, rugulose, inflated, piriform galls, attaining a size of 40 × 18 mm.†; chocolate, pulverulent, covering the entire surface, naked. Teleutospores broadly elliptical, less commonly obovate, 30–40 × 22–26 mmm.; apex rounded or bluntly acuminate, slightly (3–4 mmm.) thickened, base attenuate or rounded; epispore 2–3 mmm. thick, conspicuously longitudinally reticulate, with, in addition, a few coarse warts near the apex, pallid chestnut-brown; pedicel deciduous, hyaline, up to 15 × 6 mmm.; germ-pore apical, conspicuous, frequently crowned with a tinted papilla.
Host: Edwardsia tetraptera (J. Miller) Oliver (= Sophora tetraptera J. Miller). On pods. Herb. No. 1234. III. Tahakopa, Catlins (Southland), 70 m., C. M. Smith! March, 1923. (Type.)
The host is indigenous and widespread; it occurs also in Lord Howe Island, Easter Island, Juan Fernandez, and Chile (Cheeseman, 1906, p. 123).
The fungus attacks the pods shortly after flowering, causing them to become distorted and much inflated. In place of the normal pod, 5–20 cm. long, a short piriform gall is formed in its stead. The surface of the gall is much wrinkled and covered with the masses of chocolate-coloured sori. The epispore of the teleutospore is covered with distinct reticulations, arranged in parallel rows which converge at the poles This character separates this from every other species occurring on the genera Edwardsia and Sophora.
No less than six species of Uromyces, and two of the form-genus Aecidium, have been recorded as occurring on these two genera, as under:—
II, III. Uromyces hyalinus Peck. America. Leaves and stems.
II, III. U. shikokianus Kus. Japan. Leaves.
III. U. cladrastidis Kus. Japan. Leaves.
III. U. truncicola P. Henn. et Shirai. Japan. Stems
II, III. U. Sophorae-japonicae Diet. Japan. Leaves.
II, III. U. Sophorae-flavescentis Kus. Japan. Leaves.
I. Aecidium Sophorae Kus. Japan. Leaves.
I. A. kowhai G. H. Cunn. New Zealand. Stems.
The majority of these species of Uromyces possess verruculose teleutospores, but none have the peculiar reticulations so noticeable in our species; the gall-forming habit, and habitat on pods, are also characteristic features.
Particulars as to the Japanese species have been obtained from a recent paper by Ito (1922).
[Footnote] * Latin diagnoses are placed at the end of the paper.
[Footnote] † In this article the contraction “mmm.” is used for micromillimetres.
2. Puccinia heketara n. sp. (Fig. 129.) Compositae.
0. Spermogones unknown.
I. Aecidia hypophyllous and caulicolous; on leaves aggregated into irregular closely-packed groups on distorted spots, visible on the upper surface as discoloured areas; on stems scattered over irregular inflated areas which may attain a length of 25 mm., bright orange. Peridia embedded or slightly erumpent, cupulate, 0.5 mm. diam., margin lacerate, slightly reflexed, standing above the leaf-surface about 0.25 mm. Spores elliptical or obovate, 25–35 × 18–22 mmm.; epispore moderately and finely verrucose, 2 mmm. thick, hyaline; cell-contents orange, vacuolate.
III. Teleutosori hypophyllous, seated on minute spots which may or may not be visible on the upper surface, chocolate-brown, circular or irregular in outline, up to 1 mm. diam., frequently less, erumpent, pulverulent. Teleutospores elliptical, 45–55 × 20–26 mmm.; apex rounded
Fig. 128.—Uromyces Edwardsiae n. sp.
Fig. 129.—Puccinia heketara n. sp.
Fig. 130.—Uredo Forsterae n. sp.
or bluntly acuminate, not or slightly (3 mmm.) thickened, base attenuate, lower cell slightly longer and narrower than the upper; constricted at the septum; epispore smooth, 1.5–2 mmm. thick, pallid chestnut-brown, cell-contents vacuolate; pedicel deciduous, hyaline, stout, up to 25 × 8 mmm.; germ-pore of the upper cell apical, basal pore between one-third and two-thirds below septum, both conspicuous and papillate.
X. Mesospores rare, obovate, 28–40 × 16–23 mmm.
Host: Olearia Cunninghamii Hook. f. On leaves, petioles, and stems. Herb. No. 1244. I–III. York Bay (Wellington), 100 m., E. H. Atkinson! (Type.)
The host is endemic, and abundant throughout the North Island and lowland forests of Marlborough and Nelson (Cheeseman, 1906, p. 286).
This rust closely resembles Puccinia Atkinsonii G. H. Cunn. (on Olearia excorticata Buch.), but differs in many minor characters, especially in the non-retuse apex, thinner epispore, and smaller size of the teleutospores.
3. Uredo Forsterae n. sp. (Fig. 130.) Candolleaceae.
II. Uredosori hypophyllous, on irregular yellow spots, scattered, elliptical, 1–2 mm. long, dark chestnut-brown, bullate, pulverulent, surrounded by the ruptured epidermis. Uredospores globose to obovate, 24–31 × 18–25 mmm.; epispore finely bluntly and moderately echinulate, chestnut-brown, 1.5–2 mmm. thick, with 2–3 obscure equatorial germ-pores.
Host: Forstera Bidwillii Hook. f. On leaves. Herb. No. 1272. II. Mount Egmont (Taranaki), 1,000 m., E. H. Atkinson! 2 Feb., 1923.
The host is endemic, and distributed through the mountain-ranges of both Islands (Cheeseman, 1906, p. 393).
These three species bring the total of species collected in New Zealand to 124, this number being distributed in the following genera: Uromyces, 14; Uromycladium, 4; Puccinia, 68; Gymnoconia, 1; Phragmidium, 5; Hamaspora, 1; Coleosporium, 1; Melampsora, 2; Melampsoridium, 1; Pucciniastrum, 1; Milesina, 1; Aecidium, 11; Uredo, 14.