ON SPH:RELLA AND ITS ALLIES. 67 
Report referred to; and I should not have again noticed the plant 
had not the Rev. T. Morong (to whom I sent a scrap and a sketch 
of Mr. Jackson’s specimens) written me that a plant from Wenham 
Lake, U.S.A., much resembled my specimen and drawing, and 
P. pralongus Wulf.’ I still think it has nothing to do with 
prelongus Wulf.; the apices of the leaves are not like that, and the 
a. is quite like perfoliatus. It will be interesting if Mr. 
ackson can succeed in getting it in fruit, in which as yet he has 
not cn | Jenteal 
EXPLANATION OF PLATE 235,—Potamogeton Grifithii—1l. Plant nat. 
a. Half-ripe fruits ; one taken away to show others. b- Perianth-leaf (sepa). 
c. Structure of the lea 
ON SPHARELLA AND ITS ALLIES. 
y M. OC. Cooxz, M.A., LL.D. 
THE genus ioe la, a8 originally proposed and accepted, was 
a tolerably natural one, including such species of the old genus 
pheria as grew upon leaves, or the green and succulent parts 
of plants, the perithecia being small, more or less membranaceous, 
with oblong or elliptical sporidia of two to four cells, sometimes 
i : col ese W fi 
only one, hyaline or slightly abate ere, t, the 
limits proposed by De N s, and no very strong objection could 
by D 
be urged against them. But Saccardo was not content, and in his | 
recent ‘Sylloge’ he has split it up over five or six genera, in 
conformity with his monomaniagal idea. 
Nevertheless, we purpose to attend more to aa species than to his 
genera in the following remarks, and shall on this occasion apply 
ourselves principally to two, that is, Lesta ha or eee. of Spher- 
ella with simple spores, and Sphereila, inclnding the species with 
bilocular spores; the species with a larger number of cells must 
wait a future opportunity, when the second volume of the ‘ Sylloge’ 
is published. We purpose regarding all as Spherella, according to 
otaris, grouping them in subgenera under the names adopted by 
Saccardo, thus :— 
Spu#retia, DeNot. 
One-celled = subgen. Lastadia 
Two-celled — aS Spherella 
Three- sae: 3 Spherulina. 
and soon. This will permit of the combination of all that is good 
and emabucatls of the artificial system with the natural. 
The two first-named subgenera include in the Sylloge— 
astadia ‘ 59 —_ 
Spherella 279 
As to the soundness of Jeaine generic distinctions on the 
sporidia, we will only remind its adherents of one fact, well known 
to all who have had botanical experience, secctinily. wi ith the 
