339 
Ascocyclus Balticus, Reinke. This species I have found 
growing on the tips of the fronds of Laminaria digitata, at 
Marblehead, Mass. It is a smaller species than the preceding, 
forming dots about the size of those of Myrioneina. The basal 
layer produces colorless hairs, and erect simple filaments, the 
- upper cells of which are transformed into sporangia, the lower 
cells remaining unchanged. Described in Reinke, Algenflora, 
p. 45, and figured in the Atlas, Tab. xv. 
Beside the two species just mentioned, the genus Ascocyclus 
will contain one other American species, 4. orbicularis (J. Ag.) 
Magnus, (Myrionema orbiculare, J. Ag.) 
Elachista lubrica, Rupr. Our common Llachista, E. fuci- 
cola (Velley) Fries, varies considerably in appearance, especially 
on the coast of Maine, where it occurs not only on a number of 
different species of alga, but also on woodwork; in July, 1888, 
[ found at St. George’s Bay, Maine, an E/achista growing rather 
plentifully on Halosaccion ramentaceum, the usual habitat of £. 
lubrica. Dr. F. R. Kjellman, to whom I submitted the various 
forms of this genus which I had collected, does not consider the 
plant on Halosaccion distinct from our common species, but pro- 
nounces a form growing on Polysiphonia fastigiata to be the true, 
arctic Z. Jubrica. It is somewhat softer and paler than Z. fuczcola, 
and the free filaments are abruptly wedge-shaped at the base, 
somewhat tapering to the apex; the cells in the basal part one- 
half to one-third their diameter ; the unilocular sporangia longer 
and narrower than in &. fuczcola. © 
Elachista stellaris, var. Chorde, Aresch. A small plant, 
hardly visible to the naked eye, which I have found once only, 
when it grew on Sitilophora rhizodes, collected at Falmouth 
Mass., in September. The type, which is considerably larger, 
has not yet been found here, but should be looked for on Arth- 
rocladia villosa, on which it occurs in Europe. The variety is 
sufficiently distinguished from any other of our species by its 
small size, filaments largest near the base and tapering to the 
apex, and by the ellipsoid-pyriform sporangia. Figured and 
described in Areschong, Observationes, Part III. p. 18. Tab. II. 
Phuyllophora Trailliiz, Holmes. This minute species grows 
on exposed rocky shores, in clefts and “runways” in the rocks. 
