270 TITE JOUnXAL OF BOTANY 



FurcpUaria was placed with the Fucaeete, and Amansia with the 

 Dictvotaoeee, while A.tperococciis was relegated to the Ulvaceae. The 

 four orders of Algae included 25 genera, 24 being new, and 9 named 

 after friends of Laniouroux. The creation of new genera thus 

 initiated proceeded rapidly, and Ltngbye (1819) had 49 genera 

 fathered by Stackhouse, Agardh, as well as b}^ Laniouroux and him- 

 self, arranged in 6 ' orders ' ^ ; though unfortunately ' brown ' and 

 'red' are still mingled, Delesseria coming next to Fucks, and Viva 

 to Lamhiaria. Of these 49 genera Lyngbye was responsible for 11. 



Similarly, further advance was shown in Sweden by C. Agaedh 

 (1824). The whole of the AlgjB are now comprised in 6 orders, with 

 a total of 70 genera 2, with singular prevision, in series from the 

 simplest (Diatoms) to the ones most like land-plants {Sargassiim). 

 The main series of Green, Red, and Brown Algse begm to emerge as 

 Ulvaceae (13 gen.), Floridese (16 gen.), and Fucoideae (15 gen.). 

 But the Fucoideae still retain Lichina, Lemanea, and Furcellaina, 

 and the Ulvaceae, Forpliyra ; while an order Confervoideae includes a 

 general mixture of filamentous forms, Ectocarpus, Sphacelaria, 

 Mesogloia, with Protonema^ JSatrachospermu?n, Tkorea, Oscillatoria, 

 Chara, Ceramium, Griffithsia, &c. The larger Algae are thus be- 

 ginning to be sorted out ; but great confusion still exists in those 

 requiring more microscopic observation, and little appears to be 

 known about them beyond giving them a name. 



A short step to the elegant little volume of Geeyille^ (1830) 

 ■ shows a slight advance. A preliminary'- synopsis of Algae includes 14 

 orders and 89 genera ; but the older arrangement, commencing with 

 Sargasso m and Avorking down, is followed. Lichina is still put 

 among the Fucoids ; Furcellaria and Polyides are again outside the 

 true ' Florideae ' ; so that there can be little insight into either the 

 structure or details of reproduction of these types, although they are 

 figured in a colour one would have thought unmistakable. A more 

 remarkable omission is the whole of the 'Confervoid' forms, including 

 Ectocarpoid types, Sphacelarias, &c. ; these being still kept separate 

 as in D ill wyn\ 1809), following the Linnaean System*. 



This class of work culminates in the four volumes of the Fhgco- 

 Joqia Britannica of Haryey (1846-1851). About 360 coloui-ed 

 plates of British Marine Algae alone still constitute the standard 

 work of reference on the subject for these shores, and will not be 

 readily superseded. Though these volumes are restricted to British 

 species, the classification expresses the more natui-al relationships, and 

 all the more obvious errors of the past are put right. Brown Sea- 

 weeds (Melanophyceae) are clearly delimited both from the Rhodo- 

 phyceae and the Chlorophyceae ; the first series Melanoi)liycea? 

 (=MelanospermeiB) alone is subdivided into 6 orders, 35 genera, and 

 97 species. The system is that of Greville, much emended, and is 

 traced from Sargassum down to Ectocarpus and Myriotrichia ; 

 the text is also similar to that of Greville. 



1 Lyng-bye (Hafnia, 1819), Tentamen Hydrophytologix Danicae. 



• C. Agardh (Lund, 1824), Systema Algainim. 



3 Greville (Edinburgh, 1830), Algse Britaiinicse (col. plates). 



* Dillwyn (London, 1S09), British Confervse. 



