MICRASTEKIAS. 121 



M. FIMBRIA TA, Ralfs. Plate XL, figs. 1-8. Zygospores from 

 Eochester, 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 fj. 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, WoUe, 'fig. 4 . A form which occurs frequently 

 with almost all the subdivisions nude, devoid of spines. 



Forma, — Elephantina, Wolle, (fig. 3). Of gigantic size, di- 

 ameter 400 1^. 



Mount Everett, Mass. 



Forma, — apicxjlata, 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. BEAGHYPTEEA, 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 oi 

 lobules furnished each with two rather long, somewhat 

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



