CuxxINGHAM.— The Uredinales, or Rust-fungi, of New Zealand. ЗІ 
ymy. 
Besides Milesina, Hyalopsora Magn. and Uredinopsis Magn. (both 
included in the Melampsoraceae) are also confined to the F 
elongated sharply-pointed hyaline papilla, which may be as long again 
as the spore; the teleutospores are solitary, extracellular, septate, and 
appear to be scattered— without arrangement into sori—throughout the 
mesophyll-cells of the host. 
1. Milesina Histiopteridis n. sp. (Text-fig. 101, and Plate 1, fig. 5.) 
Polypodiaceae. 
IL. Uredosori hypophyllous, scattered, or more commonly crowded in 
groups which are linear, intercostal, and up to 15 mm. long, seated on 
irregular discoloured spots visible on the upper surface, 0-25-0-5 mm. diam., 
orbicular, bullate, covered by the epidermis, opening by an irregular apical 
pore. Peridium flattened-globose, ostiolate, composed of obovate, hyaline 
cells, outer wall coarsely and densely verruculose. Spores obovate, ellip- 
tical, or polygonal, 18-26 x 14-18 mmm.; epispore hyaline, moderately 
and finely verrucose, 0-75-1 mmm. thick, cell-contents colourless, vacuo- 
late; germ-pores indistinct. ; 
HI own. : 
- Host: Histiopteris incisa (Thunb.) J. Sm. (= Pteris incisa Thunb.). 
On fronds. Herb. Nos. 772, 774. II. Karori (Wellington), 400 m., E. H. 
Atkinson! 27 April, 1922. Kelburn (Wellington), 120 m., E. H. Atkinson ! 
G. H.C. 17 Sept., 1922. (Type > 
The very thin, moderately and finely verrucose epispore serves to 
separate this from other species of the genus. The rust is exceedingly 
common in the localities where it has been collected ; in fact, scarcel 
frond could be obtained free from the dead areas in which the uredosori 
are embedded. 
IV. UREDINALES IMPERFECTI. 
Under this heading are grouped all those forms (such as Aecidium, 
Uredo, &с.) belonging to the cycle of species whose teleutospore stage is 
unknown. These various forms were at one time believed to be separate 
entities, and accordingly were named and described separately, even when 
associated on the same host. As a result of the classical experiments 
performed by De Bary (1865), numerous investigators began to experi- 
ment with eultures and link up the various forms with their teleutospore 
or perfect form, and so a great number of the names applied to the 
different forms were gradually relegated to synonymy. In many cases, 
however, despite extensive cultural experiments, certain forms still remain 
unconnected with any teleutospore stage, in consequence of which it is 
