112 NOTICES OF NORTH AMERICAN FUNGI. 



somewhat obovate ; the lower spores subelliptic, with a little con- 

 necting pedicel, the upper globose, •0006-'00057. 



* Oidium simile. ^.— On very decayed wood. Car. Inf. No. 

 3026. On pine. No. 2334. Ohio. 



678. Oidium pulvinatum. B. & C. — Pulvinatum pallide gilvum ; 

 sporis magnis ellij^ticis, vel appendiculo addito limoniformibus. 



On damp rotten logs. No. 1573. 



Forming little pulvinate pinkish-grey tufts ; threads short, con- 

 sisting of about two joints ; spores lemon-shaped ; the little process 

 at either end being external to the epispore. It must be remarked 

 that externally there is the strongest resemblance between this, 

 Vei'ticillium pulvinatum, and Polyactis pulvinata, though the struc- 

 ture is very different. All may ultimately prove to be forms of one 

 species. I have omitted 0. crustaceum, B. & C, on stale curds, 

 because it is undoubtedly a state of some higher fungus. 0. citri- 

 nellu77i, parasitic on Peziza albo-violascens, No. 2664, and also those 

 Oidia which are states of Erysiphe. Amongst them No. 3723, 

 sent by Lindheimer from Texas, on Vitis rupestris, is the vino 

 mildew. The numbers are 3034, 5983,6153. Ravenel. No. 1675, 

 1589, and Dr. Maclagan, 431. 



* Oidium fzuctigenum. Kze. — On plums. Car. Sup. 423. 



* Fusidium gxiseum. jF?-.— On dead leaves. Car. Inf. No. 2607. 



679. Fusidium toxulosum. B. <fc C. — Candidum tenue, sporis 6- 

 Beptatis ad commissuras incrassatis. 



On decayed cabbage stalks. Car Inf. No. 6034. On pine. Penn- 

 sylvania, Michener. No. 4404. On herbaceous plants. No. 4065. 



Forming a thin white stratum ; spores fusiform, with about six: 

 septa, curiously projecting at the commissures, sometimes almost 

 annulated, very variable in length in different specimens, -002, 

 •001, -OOi, 0013 long. 



* Zygodesmus fuscus. Cd.— On various decaying substances. 

 Pennsylvania, Michener. No. 3923, 3930,4533,5135, 5137,6111. 

 Ravenel. Car. Inf. No. 1564. Alabama, Peters. 4587, 5227. 



680. Zygodesmus pannosus. B. ^ C— Argillacius, late eflfusus ; 

 granulatus ; sporis globosis minoribus. 



On the imder side of fallen limbs. Car. Inf. No. 3007. Penn- 

 sylvania, Michener. No. 4380. 



Forming a wide-spreading, cloth-like, clay-coloured stratum ; 

 spores globose, echinulate, small. 



681. Zygodesmus hydnoideus. B. Sf C— Effusus, rubiginosus 

 granulatus ; sporis minute echinulatis. 



On rotten wood. Pennsylvania, Michener. No. 4335. Car. 

 Inf. No. 2485, 4801. 



The two latter, sent out as Thelephora granosa. Rust--coloured, 

 effused, granulated, so as to look like a Hydnum ; spores globose, 

 minutely echinulate, -0006 in diameter, differs principally in colour 

 from the last. i,,.— 



