. Dansk botanisk arkiv. Plants; Plants -- Denmark. 144 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. has no more than five or six layers of cells and thalli with three layers of cells carried even nemathecia with tetraspores. A spe- cimen (No. 1110") preserved in alcohol, carried nemathecia with tripartite, zonate carpospores (Fig. 148); one layer of cells under the nemathecia was exceptionally high in another plant. Some plants have a thick basal layer of mucuous substance, but this character is not constant. To sum up the differences between P. simulans and conchi- cola we find that P. simulans h
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 144 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. has no more than five or six layers of cells and thalli with three layers of cells carried even nemathecia with tetraspores. A spe- cimen (No. 1110") preserved in alcohol, carried nemathecia with tripartite, zonate carpospores (Fig. 148); one layer of cells under the nemathecia was exceptionally high in another plant. Some plants have a thick basal layer of mucuous substance, but this character is not constant. To sum up the differences between P. simulans and conchi- cola we find that P. simulans has a lighter colour, does not ad- here to the substratum and that it must carry more carbonate of lime in its tissue for, after decalcification, the cells loosen easily from each other in vertical direction. The contents of the older cells, con- sisting principally of grains of starch in P. simulans are more ho- mogenous in P. conchi- cola. For all these rea- sons I am, I believe, authorized. to describe the present alga as a new ©liiiiiliiiliiif (ii®(S®©©i)®©®@iiii)C ®@®i)i)i)i§®ii©i@)0(ic Fig. 148. Peyssonnelia simulans nov. spec. Cross section through thallus with nemathe- cium with carpospores. b. basal layer of mucuous substance. (000 :1). This species was found at St. Thomas in the sea to the west of Water Island in a depth of about 15 fa- thoms (No. lllOii), St. Jan off St. Cruz Bay in depths of about 10-15 fathoms (No. 1916, 1752, 1828), off Ram's Head at depth of about 25 fa- thoms (No. 1943). In alcohol and dry specimens. 6. Peyssonnelia (Eupeyssonnelia) conchieola Pice, et Grun.(?) PiccoNE etGRUNOw in Piccone, Algæ eritrea, 1884, p. 317. De Toni, Syll. Alg., vol. IV, sect. IV. 1900, p. 1700. The algæ from the West-Indies that I call P. conchieola, ad- here firmly to the substratum and resemble in anatomical char- acter the type specimen from the Red Sea. The West Indian ones carry nemathecia with tetraspores, nemathecia with carpo- spores I h
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