MARINE ALG OF BEAUFORT, N. C. 407 
CLASSIFICATION AND DESCRIPTION OF SPECIES. 
KEY TO DIVISIONS. 
a. Thallus composed of single cells or of rather short filaments; multiplication purely vege- 
tative, either by simple cell division or by means of hormogonia or gonidia; color 
tisally ¥blueipreent Ue. fT U8. NAIM, WSRIB AL MURR I. MYXOPHYCE4 (p. 407). 
ea. Thallus composed of single cells, or filamentous, or forming tubes or sheets or complex 
structures of various shapes composed of closely interwoven filaments; muiltiplica- 
tion asexual or sexual—asexual by fragmentation or by motile zoospores or by aki- 
netes, sexual by similar or dissimilar motile or nonmotile gametes; color usually 
PrASs- Prec. pee tas. Se aA. Un tera Ss taeehnie oie cinta aes II. CHLOROPHYCE& (p. 417). 
aaa. Thallus filamentous or forming complex structures of various shapes; multiplication 
asexual or sexual—asexual by motile biciliate zoospores or by aplanospores or by 
certain portions of the thallus, sexual by similar or dissimilar motile or nonmotile 
gametes, in some genera by distinct eggs and sperms; color usually brown, some- 
times shading to yellowish or to olivaceous green......-..... III. PHHOPHYCEA (p. 435). 
aaaa. Thallus filamentous or forming sheets or complex structures of various shapes; multi- 
plication asexual or sexual—asexual usually by nonmotile spores usually produced 
four in a sporangium, sexual by nonmotile male gametes (spermatia) and nonmotile 
female gametes remaining inclosed within special organs (carpogonia), usually with 
the association of special cells (auxiliary cells), a fruit of a special kind (cystocarp) 
usually being formed as the result of fertilization; color usually some shade of red, 
purple, or pink, sometimes green or blackish................ IV. RHODOPHYCE& (p. 462). 
Division I. MYXOPHYCEZ (Wallroth) Stizenberger.* 
Myxophykea Wallroth, 1833, p. 4. 
Chlorospermez, in part, Harvey, 1858, p. 1. 
Myxophycez, Stizenberger, in Rabenhorst, 1860, p. 18. 
Cryptophycee, Thuret, in Le Jolis, 1363, p. 13. 
Cyanophycez, Sachs, 1874, p. 248. 
Schizophycez, Cohn, 1879, p. 279. 
Cryptophycez, Farlow, 1882, p. 26. 
Myxophycez, Forti, in De Toni, 1907, p. 1. 
Myxophycez, Tilden, r9r0, p. 1. 
BLUE-GREEN ALG&, Fission ALG#. 
Alge typically blue-green, possessing within their cells endochrome composed of 
chlorophyll and a characteristic blue pigment; pigments of other colors sometimes 
present; endochrome diffuse, rarely gathered in large, sharply defined bodies. Thallus 
variable in form and size, unicellular or multicellular, sometimes having a peculiar 
motion; plants usually in gelatinous masses, sometimes solitary among other alge. 
Multiplication purely vegetative; either by simple cell division in one, two, or three 
planes; or by means of hormogonia (multicellular fragments of the thallus, at first 
motile, afterwards coming to rest); or by means of nonmotile gonidia formed within 
gonidangia; or by means of resting gonidia (formed from ordinary cells). Algee living 
for the most part in fresh or salt water, sometimes aerial, more rarely endophytic; the 
individual cells and filaments microscopic in size; sometimes brown, violet, gold, or 
reddish. 
About 1,500 species described, representatives occurring in all parts of the world, 
at extreme variations of temperature. 
@ This group is often treated as a class under the division Schizophyta, which then includes the Myxophycez, or as they are 
Sometimes called, the Schizophycez (the blue-green alge), and the Schizomycetes (the bacteria). 
