NOTICES OF NORTH AMERICAN FUNGI. 51 



at once have referred it to that species, were not the habit and 

 matrix so very different. In Corda's plant I find a nucleus in 

 every cell, but not in this. 



* Bictyospoiium elegans. Cd.— On twigs of Magnolia glaum. 

 Car. Inf. No. 4878. 



537. Gymnosporium fulvum. B.SfC. — Effusum tenue ; sporis 

 obovatis peroxydatis e strato pallido membranaceo oriundis. Journ. 

 Linn. Soc, vol. x., p. 355. 



On decayed wood. Car. Inf. Ravenel. No. 106, 601. Curtis. 

 No. 2296. On Peziza ijsammophila. Alabama, Peters. No. 5224. 



538. Bactiidium EUisii. B.— Pulvillis melleis; sporis late fusi- 

 formibus maximis. 



On bleached maple. Potsdam. New York. Ellis. No. 204. 



Forming little honey- coloured tufts, consisting of large trisep- 

 tate, short, pedicellate, fusiform spores, swelling in the middle. 

 Externally closely resembling B. flavum, but the spores are very 

 different, approaching those of B. clavatum, B. & Br. 



539. Helicospoxium fuscum. B. Sf C— Effusum fuscum ; sporis 

 cirrba^fonnibus ; spiris quinis tenuibus. 



On pine wood. Car. Inf. No. 4960. 



Forming a thin brown stratum ; spores with about five whorls, 

 continuous with a slender pedicel. 



540. Helicosporium bzunneolum. B. Sf C— Parasiticumbrunne- 

 olum ; spiris binis crassiusculis. 



New England, Sprague. No. 5404. 



Parasitic on some Helminthosjwrium ; spores scarcely forming 

 two whorls, rather thick, with one or two septa, attenuated at the 

 base. Approaching Helicoma. 



* Helicosporium aureum. Cd.—Oi\ Pine wood. Car. Inf. No. 

 1777. On oak. No. 2239. 



541. Helicosporium griseum. B. S( C— Parasiticum ; sporis 

 griseis tenuibus ; spiris subbinis. 



On dead wood. Car. Inf. No. 2446. 



Forming a thin grey stratum ; parasitic on some Rliinotrichum ; 

 spores grey, slender, spire with about two turns. 



* Aregma speciosum. i^^.— On rose. Sartwell. No. 3075. 



542. Aregma triarticulatum. B. 4' C— Sporis clavatis triarti- 

 culatis pedicello a^quatis. 



On leaves of Potentilla Pennsylvanica. Pennsylvania, Michener. 

 No. 4833. (Aregma breve MSS.). Canada, Poe. No. 6125. 



Spores biseptate, articulations at length constricted, about equal 

 to the pedicel, which is attenuated downwards. Accompanied by 

 the imperfect form, which is Ui^edo Potentillarum, D.C. 



* Aregma mucronatum. Fr.— On some species of Pibes. Texas, 

 C. Wright. No. 3896. 



