HO THE BOTANICAL MAGAZINE. - . [Vol. xxix. .:*,.. m 



Ty lotus obtusatus J. Ac? 



Epicris, p. 429.-Id.: Florid. Morf. p. 185, Tab. XXIV, fig. 7, 8. 

 =Curdiea obtusata Harv.: Phyc. Austr. PI. 210— Kutz.: Tab. 



Phyc. XIX, Taf. 34, fig. a, b. 

 -Rhodymenia obtusata Sond. : Plant. Preiss. p. 191.— J. Ac: Spec. 



Alg. II, p. 381. 

 ^Gymnogongrus firmus Aresch.: Phyc. Novae, p. 354. 

 = Sphserococcus obtusatus Kutz.: Spec. p. 784. 



I have not seen Sonder's specimen. But after studying the 

 specimens in the Agardhian Herbarium and in the Trinity 

 College, Dublin, I am strongly inclined to refer my plant to the 

 present species. A question, however, is on the nemathecia 

 described by Harvey. 



In my specimens, the tetraspores are found sitting among 

 the epidermal cells, dispersed everywhere in the upper segments 

 and never in any form of nemathecium. They divide zonately 

 and are very small, the longer axis being not much larger 

 than the height of the epidermal cells (see figure). 



Harvery's tvpe specimens mav be ~z - — 



distinguished into two forms. One is iff !§»«ff 

 subdichotomously laciniated, with the ^oOOQ^m^ 

 breadth of segments nearly equal for the 0Oq£-P/-j Q^(^ 

 whole length. This form is excellently v_JV~" 

 shown in Phyc. Austr., PI. 210. The other 

 is irregularly laciniated at the base, palm- 

 ately lobed above, with the segments 

 broad and imbricated with the neighboring 

 ones. On the under surface of the basal 

 segments there are many papillose rhizoidal 

 processes. The illustration by Kutzing in 

 Tab. Phyc, I.e., may be taken as to re- 

 present this form. With this mv specimens 



'A pait of cross section of froi.d. 



coincide very well. x 240. 



Harvey's specimens had ovate elevations here and there on 

 the surface of frond. These he regarded as immature nemathe- 

 cia and consequently he brought the plant near by Curdiea 



