Fungi.~\ 



FLORA OF NEW ZEALAND. 



195 



Gen. XLIII. PILIDIUM, Kze. 



PeritJiecia primum lenta, subcollabentia. Spores lineares, curvas, simplices, inarticulataa, sporophoris 

 innata;. 



This genus is separated from Septoria, principally by its tough flat peritheeium. Though the habit is peculiar, 

 the separation is perhaps scarcely tenable, for all the species are not ruptured by lines radiating from the centre. 

 (Name from mXiEiov, a little pileus.) 



* Pilidmrn Coriaries, Berk. ; peritheciis subrigidis demum centro perforatis, sporis curvulis linearibus 

 utrinque subattenuatis. 



Hab. On dead leaves of Coriaria sarmentosa, Colenso. 



Peritlecia black, rather rigid, seldom collapsed, at length perforated. Spores linear, slightly curved, obscurely 

 attenuated at either end, T ^ of an inch long. — The spores are one-third longer than in P. myrtinum, Mont., and 

 the rigid perithecia are also distinctive. 



Gen. XLIV. PUCCINIA, P. 



Spores in soros congestse, epidermidem rumpentes, e mycelio enatee, endochromatibus duobus repletse. 



The ravages committed by P. Graminis, or mildew, give this genus, which abounds in species, an unpleasant 

 notoriety. The species, doubtless, require reduction very much. They occur in all climates ; P. Graminis, for 

 instance, is found wherever the more common cereals are cultivated. (Named after Thomas Puccini, a Professor 

 of Anatomy at Florence. Micheli's Puccinia is not, however, the same genus, but synonymous with Podisoma.) 



1. Puccinia compacia, Berk. ; maculis orbicularibus pallidis, soris depressis solitariis congestisque, 

 sporis compactis oblongis argillaceis stipitibus longissimis. 



Hab. On the under surface of the leaves of Myosotis cavpitata, Southern Island, Lyatt. 



Spots orbicular, of various sizes, pale. Sori solitary, and then very large, but sometimes scattered or surrounded 

 with a ring of smaller sori, depressed, girt with the cuticle ; mass of spores spongy, and extremely compact. Stems 

 long. Spores 5-0-5—475-0 of an inch long, elongated, subapiculate, often seated obliquely ; nucleus distinct. — A very 

 distinct species, remarkable for its very compact mass of spores, which do not easily separate from the matrix. 



* Puccinia Graminis, DC. 



Hab. On Triticum rigidum, with Ustilago lullata ; one or two sori only, Colenso. 



Gen. XLV. UROMYCES, Lev. 



Receptaculmn e cellulis parvis, irregularibus, vix distinctis formatum. Spores simplices, pedicellate. 



Leveille has divided this large genus with considerable skill, one of the divisions of which is here adopted. The 

 species occur in all parts of the world. In JJredo the spores are never pedicellate, but spring from cells piled one 

 above another; and in Trichobasis they are deciduous, leaving the receptacle bristling with the little stalks. (Name 

 from uro, to burn, and pv^s, a fungus, and if so, scarcely formed legitimately.) 



1. Uromyces scariosa, Berk.; hypophylla, soris distinctis epidermide persistente cinctis, sporis obovatis 

 echinulatis pallescentibus, receptaculo prominulo. 



Hab. On leaves of Geranium potentilloides, and G. dissectum, Hawke's Bay, Colenso. 

 ITypophyllous, scattered, distinct. Sori surrounded with the persistent cuticle. Receptacle prominent. Spores 

 obovate, minutely echinulate, pale when dry, -j-L of an inch long. — Very distinct from Uromyces Geranii, which has 

 globose, darker spores, and a far less decided receptacle. The spores in the dried plant are evidently bleached, but 

 they probably were of a more or less brown tint. 



