MICRASTEKIAS. 1 21 



M. FIMBRIATA, Ealfs. Plate XL, figs. 1-8. Zygospores from 



Rochester, N". H. 



Large circular; semi-cells five lobed ; dichotomously in- 

 cised ; end lobe cuneate with a broad, shallow notch, or con- 

 cave end, and two or three mucros, or spines, at each angle. 

 The ultimate subdivisions are rounded and slightly emar- 

 ginate, each furnished with two spines usually divergently 

 curved. 

 Diameter about 125-250 yw. Frequent. 



Fruiting specimens, not heretofore observed, were received 

 from Rochester, New Hampshire, collected by W. N. Hastings. 

 The zygospores are orbicular, spinulose ; spines rather slender, 

 elongate, scattered, mostly furcate at the ends, and some- 

 times notched below the middle ; punctate ends, with tips 

 recurved. 



This species is found in various forms, as illustrated by the 

 figures, and may be noted as 



Forma, GENUINA, (figs. 1, 2). The typical plant. 



Forma, NUDA, Wolle, (fig. 4 . A form which occurs frequently 

 with almost all the subdivisions nude, devoid of spines. 



Forma, ELEPHANTINA, Wolle, (fig. 3). Of gigantic sise, di- 

 ameter 400 yu. 



Mount Everett, Mass. 



Forma, APICULATA, Menegh., (fig. 2). With series of minute 

 spines bordering the sinuses. 



Forma, SIMPLEX, Wolle, (fig. 8). Small, oval, subdivisions 

 with simply one small mucro. 



This may prove a distinct species ; the two specimens I had 

 from Florida were too imperfect from drying for satisfactory 

 identification. 



M. BRACHYPTERA, Lund. Plate XXXVI, figs. 6, 7. 



About one-third longer than broad, elliptic, deeply con- 

 stricted in the middle ; sinus an acute angle somewhat 

 ampliated; semi -cells five lobed ; polar lobes longer than the 

 intermediate lobes and separated from them by a wide sinus ; 

 neck moderately distending to the dilated apex ; ( neck taper- 

 ing towards the apex, Lund.), depressed center forms a 

 wide, shallow notch. Intermediate and basal lobes short 

 and nearly equal in breadth ; twice bisected ; apices or 

 lobules furnished each with two rather long, somewhat 

 curved spines ; angles and margins of the end lobe, and 



4 



