ARCYRIA 249 



ety seems to occur with the present form. This is A. magna rosea 

 Rex, and appears to agree with the type in all respects save color. 

 The relationship here must be determined by future inquiry. The 

 capillitial threads are remarkable for their graceful slenderness, regu- 

 larity, and symmetry. 



2. Arcyria oerstedtii Rost. 



1875. Arcyria oerstedtii Rost., Mon., p. 278, Fig. 196. 



Sporangia cylindric, arcuate, 1.5 mm. high when unexpanded, 

 closely clustered, dull crimson, stipitate; peridium evanescent except 

 here and there a persistent patch, the calyculus shallow, plicate, papil- 

 lose within ; stipe short, weak, concolorous ; hypothallus distinct, mem- 

 branous, concolorous; capillitium a loosC; far-expanding, elastic net, 

 the meshes uneven, often small, the threads characterized by much 

 irregularity and many bulbose thickenings, especially at the nodes, 

 strongly spinulose throughout; spore-mass crimson or reddish brown, 

 dull ; spores by transmitted light colorless, nearly smooth, sub-globose, 

 9-10 /x. 



This well-marked species is certainly rare within our limits. We 

 have specimens from New England and from Pennsylvania. The 

 Iowa material referred to this species. Bull. Lab. Nat. Hist. la., 

 II., p. 125, is A. magna Rex. Rostafinski's figure is excellent in the 

 present case, and gives the idea of what we regard the typical mark- 

 ing of the capillitium in A. oerstedtii. Externally the species resembles 

 somewhat A. nodulosa, and the network of the capillitium is also sug- 

 gestive of that form ; the spiny capillitium is unique. 



Rare. Adirondacks, New York — Dr. Rex. 



3. Arcyria nutans (Bull.) Grev. 



Plate II., Figs. 6, 6 a, 6 b. 



1791. Trichia nutans Bulliard, Champ., p. 122, t. 502, III. 

 1794. Arcyria fla'va Pers., Romer N. Mag. Bot., I., p. 90. 

 1824. Arcyria nutans Grev., Fl. Edin., p. 455. 



Sporangia crowded, cylindric, about 2 mm. high when unexpanded, 

 pale yellow or buff, short-stipitate or sessile by an acute base ; peridium 



