158 ULOTHRICACEAE 
Exsic.: Tild. Am. Ale 730. Yellowstone Park, 1896. 
These two varieties are forms of similar character, both grow- 
ing in warm water, and it is very probable that they should be 
united into one species. 
The diameter of Ulothrix thermarum is 5-6 ہم‎ with cells 1-3 
times as long. Gloeotila caldaria has a diameter of 5 o (Kützing) 
(5.6-7.5 p, Rabenh.) with cells 2-3 times as long. 
Without study of fresh material it is impossible to say whether 
these forms belong to Ulothrix or to Stichococcus. 
11. STICHOCOCCUS Nageli, Neue Denkschr. Allgem. Schweiz. 
Gesell 10°. :::96, 72, 1849.. Gay, Rech. sur Ale, Vert. 
77-79. 1891. 
Ulothrix (Hormidium) Kitz. Spec. Alg. 349. f. 2. 1849. 
Not Hormidium Kitz. Phyc. gener. 244. 1843. 
Hormococcus Chodat, Beitr. Krypt. Flor. Schweiz, 1°: 268- 
270. 1902.7 
Filaments without a special basal cell, fine, consisting of few 
cells or long and U/othrix-like ; chromatophore a parietal curved 
disk or plate, usually covering not more than half of the cell-wall, 
containing one pyrenoid, the nucleus usually on the opposite side 
of the cell 
Vegetative reproduction by dissociation of the filament into 
single cells. Asexual reproduction through bi-ciliate zoospores 
without eyespot, which are formed singly in any cell, escape 
through a small round hole in the cell-wall, and germinate with- 
out formation of a holdfast 
Inhabitants of damp earth, or rock, or fresh water, one species 
in brackish or salt water. Type S. dacillaris Nag.  [Etym. 
00, row, series, and xóxxoc, berry. | 
The genus Hormidium as first named by Kützing in Linnaea, 
17: 89. 1843, contained three species, H. moniliforme, H. veluti- 
num, H. flaccum (Dillw.), of which the first two were omina nuda. 
His Phycologia generalis, published later in the same year, in- 
* The action of Chodat in proposing this new name is inexplicable. All the species 
included in it are placed by recent authors in Stichococcus, and the two genera are 
therefore exactly Ee except that for the type of this new genus the species 
Stichococcus flaccidus has been selected instead of S. bacillaris. Equally unjustifiable 
in the light of recent e? is the inclusion of the well-marked species S. fac- 
cidus, S. disiectus, S. bacillaris and S. fragilis to say nothing of Hormidium nitens, as 
varietal forms under Ce Sch Sammelspecies Hormococcus flaccidus. 
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