242 NEMATOGENE. 
Spherozyga Jacobi. Ralfs Ann. Nat. Hist. 1850, 332, ¢. 8, fig. 8. 
Forming thick bluish green gelatinous masses, from which 
the filaments issue in long rays. 
Trichomes elongated, ends attenuated, joints quadrate, then 
globose, the terminal one longer than broad, and usually conical. 
Heterocysts spherical, larger than the joints. Spores oblong 
or cylindrical, one or two on each side of the heterocysts. 
Sizz. Cells about :005 mm. Spores 008 x 02-7025 mm. 
Berkeley in Eng. Bot. ii., t. 2,826, fig. 2. 
Cylindrosporium licheniforme, Kutz. Spec. 292? 
dn streams, pools, &e. 
We have seen no specimen of this, and cannot say whether it is 
Agardh’s species or not. Although ignored by Continental botanists, it 
would seem from the figure, which we have reproduced, to be a distinct 
species. 
Plate XOIV. fig. 5. Portions of trichomes with heterocysts and 
spores < about 400, after Ralfs. 
Spherozyga Mooreana. Ralfs Ann. Nat. Hist. 1850, ¢. 8, f. 12. 
Trichomes scattered, joints minute, somewhat orbicular. 
Heterocysts minute, barrel-shaped, much narrower than the 
spores. Spores very turgid, often nearly orbicular or broadly 
elliptical, much larger than the joints or heterocysts. 
Sizz. Cells about °0035-004 mm. Spores about ‘008 x 
012-015 mm. 
Mixed with other alga. 
“T have only seen imperfect and dried filaments of this species inter- 
mixed with Wostoc variegatum, Moore ; in a recent state therefore the 
form of the joints may not agree with the above description, still the 
large turgid spores must distinguish it from every species but S. 
Berkeleyana, and from that it differs in its heterocysts, which are com- 
paratively much smaller and also longer than broad.”—Ralfs. 
Plate XCIV. fig. 6. Portion of trichome with heterocyst and spores 
X about 400 after Ralfs. 
Spherozyga leptosperma. Ralfs. Ann. Nat. Hist. 1850, 334, t. 8, 
f. 13. 
Forming large shapcless gelatinous masses, varying from deep 
green to pale yellowish green. 
Trichomes elongated, not constricted at the dissepiments, 
joints longer than broad, separated only by transverse dissepi- 
ments, which are not contracted, and indeed are often so obscure 
that they can hardly be detected. Heterocysts at first barrel- 
shaped, finally elliptic, broad at the spores. “Spores cylindrical, 
4-6 times longer than broad truncate, slightly broader than the 
ordinary joints. 
