296 - THE JOURNAL OF BOTANY 
26. Staurastrum erostellum, sp.n. (Syn. S. rostellum Roy & 
Biss. var. erostellum West & G. S. West, ‘F. W. A. of 8. of Engl.,’ 
Journ. Roy. Micr. Soc. 1897, p. 498, t. vi. f.18.] S. minutum, tam 
longum quam latum, profunde constrictum, sinu valde aperto 
e 
subconcentricis circa angulos obsessa, spinulis paullo longioribus 
ad angulos; a vertice vise triangulares, lateribus leviter concavis, 
a tery subrotundatis. Long. sine spin. 19-5; lat. s. spin. 19-5 p; 
at. isthm. 6°5 p 
ab. “Thurs sley Common, Surrey. 
og ape differs Jun S. eosmospinosum nob. (= S. rostellum 
Roy & Biss.) in the smaller size, in the deeper ‘constriction and 
rif Bock form of the peared ig in the absence of the large spine 
at the angles of the semicells, and in the triangular vertical view 
with more rounded angles. 
The oe size, te er, and arrangement of the smaller spines 
is the sam in S. cosmospinosum, although in the latter species 
me do et Pesitenrs in ‘Tenigtt towards the an sole. 
. Stavrastrum Bresissonm Arch. var. onpivatum Schmidle in 
Pi, “il a Sv. Vet.-Akad. Handl. Bd. 24. Afd. iii, no. 8, 1898, 
i. f.1. This variety is merely typical S. erasum Bréb. (in 
Rigen, ea Nat. Besa iv. 1856, p. 148, t. i. f. 28). 
28. i ASTRUM GL. mM Turner, var. DELICATULUM, var 
(Fig. 14.) Var. spinis sdelientianilings ‘interdum leviter sarwiiss 
ae inter angulos. ong. sine spin. 87°5 p, cum spin. 
4 w; lat. sine spin. 388°5 », cum spin. 50 »; lat. isthm. 14 p. 
Hab. Malham Tarn, W. Yorks. 
The form of the cells and the number and length of the spines 
are nearer those of S. gladiosum than any other species. The semi- 
cells are more depressed than in S. teliferum, and the spines are 
dive and more delicate. 
. STAURASTRUM ar aaa spore Nordst. Hoar minor Schmidle in 
hy til K. Sv. Vet.- d. Handl. Bd. 24, Afd. iii. no. 8, 1898, 
p. 56, t. ii. f. 35. ae this variety = be, it is certainly not 
a form of S. inconspicuum Nordst 
30. SraurastRUM Hoesinen West, ‘F. W. A. a = Ireland,’ 
Journ. Linn. Soc. Bot. vol. xxix. 1892, p. 177, +. xxiii. f. 6. As 
this species has been referred by some authors to ’S.or Meniis Ralfs, 
var. extensum Nordst., we give a figure of each for comparison 
(S. en: fig. 20; S. orbiculare var. extensum, fig. 19). 
S. Hibernicum is much larger, with well-marked basal angles and a 
somewhat fla dened apex, and the vertical view possesses much 
broader angl ll-membrane is also delicately punctate, 
ar. FarquHarsonit nit (Roy & Biss.) nob. [Syn. 8. Farguharsonii 
Roy & Biss. in Ann. Scot. Nat. Hist. 1898, . BT; 1894, pe iv. f. 3.] 
