Cunnincuam.—The Uredinales, or Rust-fungi, of New Zealand. 33 
Eleven species of Aecidiwm are recorded here; of these, nine are 
endemic and two indigenous. 
KEY то THE ForM-SPECIES OF AECIDIUM. 
Host belonging to the family па сасе 
Aecidia on large distorted а L4 
Aecidia in ык groups, n саз оп 1 distorted areas 2. A. | cse IMS 
Host belonging to the family Leguminosa 3. A. kowhai. 
Host belonging кє the family Tiliaceae З 4. А. ко, 
Host belonging to the fami к Муорогасеае ; 5. А. Муор 
Host belonging to the family Plantaginaceae .. 6. A. Plantagini -variae. 
Host belonging to the family Rubiaceae xs 7. А. hupi 
Host be to the fa m 
pore minutely verruc 
Aecidia crowded in distorted areas 11. A. Macrodontae. 
Aecidia scattered A. Celmisiae-petiolatae. 
Epispore covered with deciduous tubercules. 
Spores obovate or elliptical .. сес б. d. аем discoloris. 
Spores elongate-elliptical is Am .. 10. A. Celmisiae-Petriei. 
l. Aecidium otagense Lindsay. (Fig. 102.) Ranunculaceae. 
Linds., 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 poly- 
gonal, 23-36 mmm. diam.; epispore hyaline, delicately and closely verru- 
culose, 0-75 mmm. thick, cell-contents granular, orange. 
Hosts :— 
Clematis indivisa Willd. On leaves, stems, petioles, and sepals 
H os. 188, 434. Lake Horowhenua, Levin (Wellington), 
30 m., E. H. Atkinson! 26 Oct., 1919. Peel Forest (Canterbury), 
H. Allan! 8 Nov., 1919. Manawatu Gorge (Wellington), 
150 m., J. OW. 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, weny centimetres long, on 
the stems and leaves of the hosts. The mycelium is perennial, so that 
eason. 
The specimens on Clematis Colensoi are badly infected with Tuberculina 
persicina (Ditm.) "grt uem Appendix, p. 50). Lindsay records the rust upon 
Clematis hexasepa 
The aecidia "S м 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 Ta That the 
in water these give rise to infection hyphae. 
2—Trans. 
