16 WITTROCK, SPORES OF THE MESOCARPEZG. 
1 Gonatonema ventricosum nov. spec. 
G. sporis a fronte visis oblique ellipticis (latere uno magis 
convexo quam altero) apicibus truncatis, a latere visis ellipti- 
cis apicibus truncatis, masosporio levi, flavescente; crassitu- 
dine cellularum vegetativarum 5—7 u, longitudine 6—16plo 
majore; longitudine sporarum 22—29 wu, latitudine 13—-16 j, 
crassitudine 12—15 u. 
Habitat in Suecia in aquario magno caldari horti botanici 
upsaliensis; ubi cel. TH. M. FRIES primus observavit. 
2 Gonatonema notabile (Hass.) nob. 
G. sporis a fronte visis geniculato-subeylindricis (latere 
uno convexo, altero concavo) apicibus truncatis; crassitudine 
cellularum vegetativarum 12,5—14,1 u (tio rita lin. paris).!) 
Hab. in Anglia ad Notting Hill, ubi cel. A. H. HASSALL 
invenit >). 
!) The measurements are given after KUTZING in Species Algarum, p. 434. 
HASSALL never gives any definite measurements, as is well known. 
His figures of Zygnemee and Mesocarpee would seem in general to be 
magnified 300 times. If this is the case with Mesocarpus notabilis also, 
it ought to be a fourth part smaller than KÖUTZING says. 
I will here quote the description of the species which HASSALL gives 
1. c. He says: »Mesocarpus mnotabilis Hass. Character: Filaments at 
first cylindrical, but subsequently becoming angulated, the angle of 
flexion being situated in the centre of each cell. Cells usually about 
eight or ten times as long as broad, but frequently longer. Sporangia 
non-symmetrical, a single one being placed in the angle formed in each 
[CS 
Ne 
of the cells. -— Mougeotia notabilis Hassall, in Ann. Nat. H. vol. på 
p. 46. — Hab. Found in great abundance in some brick-fields near 
Notting Hill: A. H. H. — I am unwilling to create a new genus for 
the reception of this curious and anomalous production, and am induced 
to refer it to Mesocarpus, on the supposition that were the filaments 
in any case to conjoin, amd sporangia to be formed, that these would 
present the characters of the genus, and be either spherical or oval». 
