124 ARCHER, ON PALMOGL@A MACROCOCCA. 
are common, whilst the gelatinous mass is rather firm—thus 
agreeing with Kiitzing’s character in that regard, upon which 
he lays so much importance. His Palm. protuberans and 
Palm. macrococca are much smaller plants. I believe I have 
found here one or both, but Ihave not as yet been at all able 
to satisfy myself as to their actual nature. It seems proba- 
ble that the Coccochloris protuberans (Spreng., Hass.) may 
be identical with P. macrococca. 
But here any further power of comparison of Kiitzing’s 
and Braun’s plants ceases, owing to the meagre description of 
the former. As to the possible identity of any other of 
Kiitzing’s forms with P. macrococca or others, I have here- 
inbefore ventured to express a conjecture. 
But the plant I identify as M. chlamydosporum (De Bary), 
or which, perhaps, I believe I might possibly be more correct 
in assuming as a variety thereof, I had at first thought to be 
a distinct species, and so, indeed, it may possibly still prove to 
be; and I had, when this paper was read, drawn up a descrip- 
tion of it as such; but if I err in modifying my former opinion, 
it is at least an error on the right side. I shall, however, 
endeavour to put forward a general description of the plant 
which occurs here, reserving an allusion to the points in 
which it differs from De Bary’s, until after a brief reference 
to the generally received views as to the affinities of the 
genus. 
MeEsoTmNIuUM CHLAMYDOSPORUM (De Bary). Var. f. 
General description.—Mass light green, gelatinous, rather 
firm ; cells oblong, cylindrical, ends broadly rounded ; chloro- 
phyll-plate in edge view usually axile, narrow, fusiform, 
pointed at the ends, which do not reach the extremities of 
the cells, after division blunt at the ends towards the septum 
dividing the mother-cell; nucleus, when to be seen, forming 
a small rounded body, lying upon one of the front surfaces of 
the plate; granular contents very dense and abundant, often 
preventing the view of the chlorophyll-plate, which is there- 
fore very rarely discernible in front view. Conjugation 
effected by the extension and protrusion of the entire con- 
tents, which touch and incorporate at any point, the parent. 
cells uniting in many varieties of position, the original cell- 
membrane of each being thrown off, in its almost original 
form, each half often bent at an angle, as if due to a separa- 
tion at a suture. Zygospore, at first shapeless or irregular, 
assuming finally an ovate or elliptic outline, and becoming 
surrounded by a comparatively thin, sharply defined mucous 
