174 Phillips . — The Development of the Cystocarp 
Delesseria sanguinea, Lamx. 
This plant is one of the most conspicuously beautiful of all 
the Red Seaweeds, and must have been known from early times. 
It was the Fucus sanguineus of Linnaeus (1767), and on the 
disintegration of that comprehensive genus became the Deles- 
seria sanguinea of Lamouroux (’13). J. G. Agardh (’51) could 
not, however, find that its characters harmonized with those 
of 'other species of Delesseria , and he therefore adopted for it 
the generic name W ’ormskioldia, proposed by Sprengel (’27), 
but unlike that author, made it the single species of the 
genus. Later (’76), finding that this name had already been 
appropriated, Agardh utilized Stackhouse’s (’01) generic 
name Hydrolapathmn. More recent writers have assigned it 
to Delesseria or to Hydrolapathum as they recognized or denied 
its near relationship to such other typical species of Deles- 
seria as the D. Hypoglossum , D. alata, and D. ruscifolia of 
Lamouroux. Kiitzing, by transferring such species as those 
last named to a genus Hypoglossum , and retaining the designa- 
tion Delesseria only for D. sanguinea and two South Atlantic 
plants, has shown a certain agreement with Agardh’s view 
of the generic distinction of the Delesseria sanguinea of 
Lamouroux from the other species of that author. Schmitz 
(’89), in his c Uebersicht,’ has reverted to the older arrange- 
ment of Lamouroux. This course has, as late as last year (’97), 
called forth a protest from Agardh, who re-asserts his belief 
in the generic isolation of D. sanguinea. 
There is, moreover, a wider question at issue among algo- 
logists in connexion with this species. While Kiitzing has 
separated D. sanguinea from other species of Delesseria , he 
has retained it in the same family with them. Agardh (’76), 
however, and in this he has been followed by Hauck (’85) and 
others, has removed it altogether from among Delesseriaceae, 
and placed it among Rhodymeniaceae. This course he still 
defends in his latest publication (’97). 
It thus appears that there is a difference of opinion, not 
