138 < 0LZJN8 WD ill i;\ El . 



on the same Fueus plumostu L.; Agardh's genua has been generally 

 accepted, and many recent species have been included in it. 

 Ruprecht, however, 1856, p. 335, calls attention to the priority of 

 Stackhouse's name, ;m<l makes the combination Plumaria tupUni- 

 *, and also uses the P. pectinata of Stackhouse. Otto ECunze, 

 1891, p. 911, takes the same position, and makes new combinations 

 for 16 species of Ptilota, some of which, however, are unnecessary, 

 as the species had already been properly transferred to Euptilota 

 Kiitz. Schmitz, L889, p. 450, retains Ptilota for most of the 

 species, including Stackhouse's type for Plumaria, but revi 

 Plumaria for Ptilota elegants, Bonnemaison, a speciea unknown to 

 Stackhouse; and in 1896, p. 7, transfers to Plumaria, Ptilota Schous- 

 boei Hornet in Hornet «S: Tlmret, ls7fi, p. 34, Cullit/iamuiou elegant 

 Schousboei in Agardh, L828, p. L62. Under the international rule- of 

 nomenclature, and probably under any rule, the name Plumaria 



must be retained Tor Stackhouse's type, P. plumosa and its congeners; 



Ptilota founded on the same species, has no standing, and the only 

 name we find available for the species placed under Plumaria by 

 Schmitz is Gymnothamnion -1. G. Agardh, ls'.L\ p. l'7, type Callitham- 

 nion elegant Schousboe. Accepting this in place of Plumaria Schmitz, 

 not Stackhouse, it will include Gymnothamnion elegant (Schousboe) 

 J. (i. Agardh, L892, p. '27: Callithamnion elegant Schousboe in Agardh, 

 1828, p. l'•>- , ; Hornet & Thuret, 1S70, p. 32, PI. X; Ptilota Schousboei 

 Bornet in Hornet «S: Thuret, 1876, p. 34; Plumaria Schousboei Schmitz, 

 1896, p. 7. G. sericeum f Harvey) comb, now; Ptilota sericea 

 Harvey, 18 1846-1851, HI. CXCI; P. elegant Bonnemaison L828, p. 70; 

 Plumaria elegant Schmitz, 1 sso, p. 450. G. Harveyi Hooker) 

 comb, now; Ptilota Haneyi Hooker, 1845, p. 271; Plumaria Ilurrri/i 

 Schmitz, ls'.tii, p. 7. G. pellucidum (Harvey) comh. now; Ptilota 

 pellucida Harvey in Hooker & Harvey, I s -").'; Is.",." p. 257; Plumaria 

 peUucida Schmitz, L896, p. 7; also a new species, described below. 



The taxonomy is somewhat complicated; of the five specie- credited 

 to this genus, two were published in L828, Ptilota elegant and Calli- 

 thamnion elegant; in l s 7»'> Hornet transferred the latter to Ptilota, 

 but as the specific name elegant WBS preoccupied, changed it to P. 

 Schousboei. In 1896 Schmitz transferred both to Plumaria with 

 specific name- unchanged, hut in 1892 J. G, Agardh had used Culli- 

 thamnion elegant as the type of his new genus Gymnothamnion, hence 



18 Fucut sericeua Gmelin, L768, p. l 19, PI. XV, fig. •"». from Kamtachatka, 

 can hardly he a Gymnothamn - Ruprecht, L856, p. 



