Oligonema. 171 



epispore, but the latter always in the markings forming a 

 reticulation. 



Oligonema flavidum, Mass. 



Sporangia crowded, sessile, bright yellow, shining, mass of 

 capillitium and spores bright yellow; elaters scanty, short, 

 4 5 p. thick, sometimes with an elliptical interstitial swelling, 

 tips variable, subacute or inflated, densely covered with minute 

 raised points ; spores globose, ivith thin raised bands combined 

 to form a very irregular network, bands not punctate, 7 9 jj. 

 diameter. 



Perichaena flavida, Peck, 26th Annual Report of New York 

 State Mus., p. 76 (1874). 



On moss, wood, &c. United States. 



The sporangia are irregular in form, circular, angular, or 

 elongated. Forming patches of considerable extent. 



Superficially resembling 0. nitens, but distinct in the elaters 

 and spores. The elaters agree with those of 0. minutula in 

 being rugulose or covered with small points or band-like 

 wrinkles, but in the present species the spores are smaller and 

 the reticulations more irregular in form and size. 



Oligonema minutulum, Mass. 



^Sporangia scattered, rarely aggregated, sessile on a narrow 

 base, lemon-yellow, dull, capillitium very scanty, elaters simple, 

 short, cylindrical, 5 6 iJ. thick, rugulose, and with a very open, 

 indistinct spiral, tips obtuse, rounded ; spores globose, and with 

 slightly raised, flattened bands forming a network of numerous, 

 almost regular and equal-sized polygons, 12 14 p, diameter. 



Oligonema minutula, Mass., Rev. Tricb., p. 348, fig. 20. 



Type in Herb. Berk., Kew, no. 10902, marked " Trichia 

 minutula, D. R, et Montag., Algiers," Algeria. 



So far as I am aware, the present species has not been 

 described by Montague. Related to 0. nitens, but known by 

 the scattered, dull sporangia, and the very few, short elaters 

 haviDg thick, rugulose walls, with an indistinct open spiral ; 



