KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 15 



secundata (Lyngb.) Thur. In Alg. exsicc. (1859) N:o 829 Mr. Rabenhorst described a 

 new species M. strictissimum, of which he has låter given a figure in Kryptog. Fl. Sachs. 

 (1863) p. 236, which is very misleading and does not agree with specimens in Alg. exsicc, 

 1. c. In Flor. eur- alg. v. 3 p. 375 Rabenhorst added a new character to this species 

 »ad genicnla paulluin constrictis», probably derived from his figure and not from a living 

 plant. In Grevillea XI (Dec. 1882) pag. 75 Mr. M. C. Cooke founded a new species, M. 

 Vexator, afterwards sketched in his Brit. Fresh. Alg. tab. 73, fig. 1. It was then that 

 the mode of its ramification was for the first time in any way accurately fignred. Prof. 

 F. Kirchner had however before (in Schlesch. Algenfl. p. 70) correctly described the pe- 

 culiar ramification in this genus, in this way: »die untere von zwei Zellen seitlich unter 

 der daruber stehenden hervorwächst, aber nicht an der Ausbuchtungsstelle, sondern erst 

 ein Stuck dariiber eine Querband biidet.» Mr. Kirchner must therefore be considered as 

 the author of the genus Microthamnion. According to original specimens, received from 

 Mi". Turner, the cells of M. Vexator are 3 — 4 ju broad, by 12 — 77 ,u long., whereby this 

 species comes very ne ar to the specimens of .1/. strictissimum in Rab. Alg. exs. 1. c. 

 (Perhaps they are identical). 



1. M. Kutziiigianum (Näg.?) Kirchn. 1. c. 



Crass. cell. 3—4 ,u; long. 10— 20(— 30) u. 

 Bluff inter Sphagna (51). 



Gen. 5. Aphanochaete A. Br. (1851). 



Genera Herposteiron Nteg. in Kutz. Spec. Alg. (1849) p. 424 et Ochlochcete Thwaites 

 in Harw. Phycol. Brit. (1849) tab. 226 cnm speciebus eorum mihi dubia sunt. 

 Genus Apltanochaite in 2 [vel 3] subgenera dividi potest: 



A. Aphanochcete sens. strict. setis singulis e dorso medio cellularum egredientibus; 

 [B. Ochlochcete » » » apice » » ] 



C. Polychcete » pluribus » processubus » » 



Subg. 1. Aphanochcete. 



1. A. repens A. Br. Verj. in der Natur p. 196; Rab. Fl. eur. Alg. 3 p. 304, fig. 114. 



Hutt Valley (60). 



2. A. globosa (Nordst.); Herposteiron glohosa Nordst. Alg. Sandvic. p. 23, tab. 2, fig. 22 — 23. 



Forma paullo minor. Diametr. cell. circ. 12 ,«. 



In Nitella translucenti* tricellulari Nordst. in »Lake Pearson» (1) epiphytica. 



Forma paullo major. Diametr. cell. 19 — 28 ,u. 



Taupo (158; membrana cellularum interdum incrassata); Omatangi (239, 240, 249, 264). 



Subg. 2. PolychcMe nov. subspec. 



