NOSTOCE, 239 
Uncertain Species. 
Anabaena inequalis. (Ralfs.) Braun., in litt. 
Forming extensive strata consisting of thick gelatinous masses 
of a deep green colour. 
Trichomes stout, moniliform, elongated, joints distinct, at first 
quadrate, finally orbicular, with granular contents. Heterocysts 
globose, broader than the ordinary joints, occurring at short 
intervals. Spores 3-4 times longer than broad, with truncate 
ends, in chains of two to five. 
Sizz. Not determined. 
a aul tmequale, Ralfs Ann. Nat. Hist. 1850, 335, 
t. 9, fig. 1. 
Spherozyga inequalis, Kutz. Tah. Phye. i, t. 96. Rabh. 
Alg. Eur, ii., 194? 
In boggy pools. 
We have seen no specimens of this, or of Kutzing’s Spherozyga 
inequalis, and therefore cannot pronounce on their identity. Mr. Ralfs 
says that “this plant forms extensive strata, composed of thick 
gelatinous masses of a deep green colour. Filaments elongated, con- 
sisting of from 100 to 200 cells, and, being stonter than in most species 
belonging to this genus, visible to the naked eye. Ordinary cells dis- 
tinct, quadrate in immature specimens, but at length nearly spherical, 
appearing punctate on account of the scattered granular matter which 
they contain. Vesicular cells (Heterocysts) spherical broader than the 
ordinary joints and occurring at short intervals. Spores 3 to 4 times 
longer than broad, with truncate ends; in chains of from two to five 
members.” May be known from A. Ralfsii by its spherical heterocysts 
and catenate spores. 
Plate XCI11. fig. 4. Trichomes with heterocysts and spores X 400; 
after Ralfs. 
Genus 96. APHANIZOMENON. WMorren. (1839.) 
Thallus membranaceous, free swimming, bright blue, blue 
green, or becoming olive. Trichomes medium size, a little 
attenuated towards the apex, agglutinated parallelly and very 
densely in fascicles, joints cylindrical, very closely connected, 
pale blue, nearly colourless and delicately granular. Spores 
elongated, cylindrical, rounded at the ends, pale blue, or some- 
what olive, exospore thin, quite smooth. Borz? Alg. Ficochrom, 
p. 279. 
Thuret places this genus next to Anabaena, but, in the absence of 
heterocysts, it seems that its proper place would be in Lyngbye, allied to 
Oscillaria, We have retained it here, in preference to altering the “key 
to the genera,” which is given on page 221. 
