Hosts : Phormium tenax Forst. On leaves. Herb. Nos. 755, 775. Plimmerton (Wellington), 20 m., R. Waters! H. Drake! G. H. C. 16 Jan., 1922. (Type.) Phormium Colensoi Hook. f. Herb. No. 757. Tokaanu-Waiouru Road, Taupo, 800 m., E. H. Atkinson ! 11 March, 1922.

II. Uredosori hypophyllous, seated on discoloured spots visible on the upper surface, scattered or more commonly crowded into irregular groups often covering the entire under-surface of the leaf, elliptical, l mm. long; or confluent and up to 6 min. long, ferruginous, bullate, pulverulent, surrounded and partially covered by the ruptured epidermis. Spores obovate, elliptical, or subglobose, 21-30 X 1.7-22 mmm.; epispore golden-brown, coarsely and sparsely echinulate, 2.5-3 mmm. thick, cell-contents brown, granular; germ-pores scattered; 3-5, commonly 3, conspicuous.

II. Soris uredosporiferis hypophyllis, in maculis discoloratis, raris vel in catervis irregularibus, ellipticis. 1 mm. longis, aut confluentibus vel 6 mm. longis, ferrugineis, bullatis, pulverulentibus, rupta epidermide cinctis et partim tectis. Uredosporis obovatis, ellipticis vel subglobosis, 21-30 X 17-22 mmm.; episporio flavo-brunneo, rustice raro echinulato, 2-5-3 mmm. crasso, contentu brunneo, granuloso; foraminibus germinis raris, 3-5, communiter 3, conspicuis.

Both hosts are indigenous, the former being common throughout, and extending to Norfolk Island, whilst the latter is endemic. (Cheeseman, 1906, p. 716.)
This rust is characterized by the small spores, coloured coarsely and, sparsely echinulate thick epispore, and conspicuous scattered germ-pores. Severely infected leaves are useless for milling purposes.

Hab.: In foliis vivis Phormii tenacis Forst. et P. Colensoi Hook. f. Tokaanu-Waiouru Road, Taupo, New Zealand, 800 m. E. H. Atkinson.

The host plants are indigenous to New Zealand. In New Zealand Phormium tenax is an important fibre plant. Cunningham (1931a) reported that heavy rust infection was damaging to the leaves, rendering them worthless for fibre purposes. Fortunately the disease is not widespread: it is of minor economic importance.