Uromyces .] 
VIII. FUNGI. 
625 
on the under surface of the leaf ; stroma prominent. Sori surrounded with 
the persistent cuticle. Spores obovate, echinulate. 
Northern Island: on Geranium leaves, Colenso. 
2. U. citriformis, Bab. in FI. N. Z. ii. 195. Spots obliterated. Sori 
scattered, surrounded with the persistent cuticle. Spores large, linear-shaped, 
brown, shortly stalked. 
Northern Island: on Microtis? or Thehjmitra ? leaves, Colenso. 
49. USTILAGO, Link. 
Very minute Fungi, deep-seated in the tissues of the plants they infest, 
and occupying the whole of the part. Spores simple, arising from delicate 
threads or produced in the form of closely-packed cells that break up into a 
powdery mass. 
This genus forms dusty masses on the seed, stems, and other parts of plants, and is found 
in all parts of the world. The U. segetum is the smut of wheat, oats, and barley. 
1. U. Candollei, var. a. Tulasne ; — Berk, in FI. N. Z. ii. 196. Form- 
ing elongated masses on Polygonum peduncles. Spores elliptic-ovate, smooth, 
violet-coloured. 
Northern Island: on the inflorescence of Polygonum prostratum, Colenso. 
2. U. endotricha, Berk, in FI. N. Z. ii. 196. t. 106. /. 4. Forming 
oblong black bodies on Gahnia peduncles. Spores subglobose, mixed with 
crisp fibres, minutely granulate. 
Northern Island : on the inflorescence of Gahnia , Sinclair. 
3. U. bullata, Berk, in FI. N. Z. ii. 197. t. 106./. 12. Forming bul- 
late black long spots on the inflorescence of grasses. Spores irregularly sub- 
globose, mixed with threads, obscurely rough, nucleus pale. 
Northern and Middle Islands : on Triticum scahrum, Raoul, Colenso. 
50. 2ECIDIUM, Persoon. 
Forming dark spots or pustules on leaves and other parts of living plants. 
Peridium membranous, with a lacerated or toothed reflected orifice. Spores 
concatenate, collected into sori. 
A vast genus, found in all parts of the globe, often very destructive to vegetable tissues. 
1 . JE. Ranunculacearum, DC. ; — Berk, in FI. N. Z. ii. 196. Spots 
obliterated. Peridia densely crowded into irregular heaps, orange-yellow. 
Northern Island: on leaves of Ranunculus rivularis, Colenso. (Europe, Tasmania, 
etc.) 
2. JE. monocystis, Berk, in FI. N. Z. ii. 196. t. 105. f. 15. Peridia 
large, solitary, persistent on the upper surface of the leaves towards their 
tips, surrounded with a tough border. Spores pale orange-yellow. 
Northern Island : on the tips of the leaves of Helophyllum Colensoi, Colenso. 
