S. protecta Wood.
A study of American specimens of this species from Massachusetts, Connecticut, New Jersey, Michigan and Illinois, shows that like S. Grevilleana there are always some cells with two chromatophores. I have twice found this species producing aplanospores.
S. tenuissima (Hass.) Kütz var. rugosa Transeau.
P. B.-A. specimen No. 456, Easton’s Pt., Newport, R. I., belongs to this variety rather than the type, as shown by the scrobiculate spore wall. In Mr. Bullard’s collection there are also specimens of the variety from Pennannock, N. J., and from Spy Pond, Lake St., Arlington, Mass.
S. Farlowii nov. sp.
Cellulis vegetativis 24-30µ × 70-180µ, dissepimentis replicatis; chromatophoris singulis, rarius duobus, anfractibus arctis 2.5-6; cellulis fructiferis inflatis (ad 39-60µ); zygosporis ellipticis, polis plus minus acuminatis, 32-45µ × 48-93µ, membrana media glabra, lutea.
Vegetative cells 24-30µ × 70-180µ, end walls replicate; 1 (rarely 2) chromatophore making 2.5-6 turns; fertile cells inflated to 39-60µ; zygospores ellipsoid, ends more or less pointed, 32-45µ × 48-93µ, median wall smooth, yellow. Type in herb. E. N. T. Coll. No. 2955, 2956, 2957.
In Mr. Bullard’s collection there are specimens of this species from Lexington, Arlington, and Middlesex Fells, Mass. The P. B.-A. specimen No. 362, labeled S. Grevilleana, from Medford, Mass., belongs here, rather than to S. Grevilleana, in which the spores are distinctly ovoid with broad rounded ends.
S. groenlandica Rosenvinge.
This interesting form is characterized by quadrately inflated fertile cells, highly refractive cell walls, and unusually long cells and spores. In Mr. Bullard’s collection there are specimens from Stony Brook, South Framingham, Middlesex Fells, Wayside Inn, North Eastham, and Malden Fells, Massachusetts. The P. B.-A. specimen No. 363 labelled S. inflata, Orange, Conn., belongs to this species.