534 BULLETIN OF THE BUREAU OF FISHERIES. 
cg; Bilaments; branched) 4.004 Ju itl. gate pCa ne a Oe RD a, EA t. 
2. Bilamentsilacking heterocysts ie raaae ane enews. ater tale aay HYDROCOLEUM (p. 413). 
ag, Hilamentspossessitig HEterOCySts edt caus arse t camer iris eee PLECTONEMA (p. 415), 
AA. Color green; filamentous or forming tubes or sheets or complex structures of various 
shapes composed of closely interwoven filaments; usually attached, sometimes float- 
ing; some forms minute, living on or in shells or other alge; some forms incrusted 
with lime.. Neha bttebne| storing Wh sake teskaise to cau orci se aac eck GL CLILOR@ RELY CHa 
a. Frond flat, expanded LE aT SCOPE sername ne NOM MATTE mNEnY SMO VEREER!Y Sus) catah ny Neh cn tAs \itorin RU AYS. UP AME go b. 
6. Outline irregular, indefinite, usually floating, attached when young..............ULVA (p. 420). 
bb. Outline regular, definite; usually attached....................... Enteromorpha linza (p. 420). 
ac... Frond forming a hollowetubed am ¢ stilt, ode ab eee seats Mle ee eho Leh av aes wel canes eRe re ee &. 
C.4 Wall ‘of tbe couiposed of celisa cia.) 2a. hota eumt eA decries asi ENTEROMORPHA (p. 418). 
cc. Wall of tube not cellular, tube consisting of single unsegmented cavity of various 
complicated formsy ap 25 seit able veie esovdese duets pore weet aid AON EET Natu, coon ba aiepaeeaey AeA aS d. 
d. Frond consisting of an upright stalk arising directly from the base, pinnately 
branehed*aboves.®),; MONE). LOGE kee ey eae Altes eines sh niente BryYopsIs (p. 431). 
dd. Frond consisting of a creeping stem attached at intervals, from which arise erect 
branches of varioustorms. 2/0)... ORR acek austenite «jn asia ckowiaestel es CAULERPA (p. 434). 
aaasehrongiflanientousee steerer ee oats oc eackattas clatoreonniet Orne ES oe eee e. 
e. Frond microscopic, invisible to naked eye or visible only as a green stain on the sub- 
CECT Sree ORME ioeoen De Or Fo OMG: boonies COM ORBE ORCS nonin bccscde J6gemAM onthe te 
fperond living in-wallsiofother alge ce.p <1. Gity-stucians pesos, ete eee ale ENDODERMA (p. 423). 
eebrond diving jom surtacevol shells, th.c4. a. Sete ve nee seheveleeee no scr eer seeeses ULVELLA (p. 423). 
His Frond living wishin surtace of shells }))./ 2 21. syinirareekesers ae) eistece. 01s, 01s /a,« » 01 clase GomonTIa (p. 429). 
en phrondyedstly: vasibletomakedseves tite koteamicl cna teire voce es ceae ake eee ee g: 
g. Filaments unsegmented, loosely interwoven to form an irregular mat......DERBESIA (p. 430). 
99. Hilaments segmented at reguilarinter valsax ssc upyeaicpatclsterele less sles osiv.s wie sia) vvseshvanede oh. CCC h. 
A, gHilaments) inbranched rie ery a ee ee areas aan tee CHATOMORPHA (p. 424). 
hh. Filaments regularly branched; attached or floating..................CLADOPHORA (p. 427). 
hhh. Filaments usually with few irregular, rhizoidlike branches, sometimes un- 
branched, usually motattached . cmt ansaid on ve cae cae sone RHIZOCLONIUM (p. 427). 
aaaa. Frond composed of branched filaments closely interwoven to form a complex structure...... i. 
i. Frond fan shaped on an evident stalk, incrusted with lime. .................. UDOTEA (p. 433). 
ut. Frond terete or somewhat flattened, dichotomously branched, spongy, not incrusted 
with lime......../. F . .CODIUM (p. 432). 
AAA. Color brown, Be te wan cee Cree inseam or Bere couples ARS 
of various shapes; usually attached; some forms minute, living on or in other alge 
. III. PHHOPHYCEA. 
a. Frond ginrsiaics Wath bre syateratete sMiiicy cies aes che NSH SRNR ooh ea i a aR ae OO ne ale b. 
v: Brond! easily-visible tomakedweyes tN) 5. Wy elens aeoirn ci ree ECTOCARPUS (p. 437). 
bb. Frond microscopic, almost or quite invisible to naked eye...... 2.0.0.0. cence eee eeeneeeeees c. 
¢, Hroud growing’ on the surtace of other ‘alg cebinuincun- ewan cise ccd Hue oe used ne d. 
d. Frond more or less spherical in outline, composed of decumbent radiating 
filaments united to form a basal layer from which arise erect filaments, MyRIONEMA (p. 445). 
dd. Frond having no regular outline, composed of decumbent, irregularly dichto- 
THOUS MIGMENtS 3. Pe eae tc hogs hiatal erase ape SA a ate PHAOSTROMA (Pp. 442). 
ce. Frond growing within the surface of other alge. .......... 0. cece cece cece eee c ete eeeees é. 
e. Frond forming its fruits above the surface in more or less spherical, dense 
clusters......... Hae ..ELACHISTEA (p. 444). 
ee. Frond baie: its feats augcy fae gurface igieie or in n iregular, ee groups 
aide a ghasins winds ease SS ys ..STREBLONEMA (p. 440). 
aa. Frond, Surv agar haere Sara ht i ie eae eae i oa Ma are te LEATHESIA (p. 447). 
aaa. Frond mostly terete, with distinct central axis and lateral branches.................-0.-0-00-. Jie 
j. Frond with many lateral branches leaflike, giving the appearance of stem and 
leaves, usually with berrylike floats... .....--2 2.0.00... .0 0. see eeeee+++SARGASSUM (p. 451). 
