not usual, terminals usually single, whole plant stouter and 

 less flexible. 



NITELLA SUBGLOMERATA, A. Br. Nitella subglomerata, A. 

 Br., Characeen aus Colombia Guyana and Mittelamerika, 1858 

 (Monatsbericht d. Berl. Akad). Later N. acuminata var. sub- 

 glomerata, A. Br. 



" Acuminatae" must be utilised as the name of a group, both 

 of monoecious and dioecious species, and it seems best to adopt 

 A. Braun's former opinions, and keep the species distinct, a 

 position which it is clearly entitled to hold. 



This species is essentially southern, and particularly south- 

 western, found chiefly from Missouri to Mexico, though stray 

 specimens are reported from Ills., and even New Jersey and 

 New York. The plant is spreading, and diffusely branched, 

 verticils of 6 to 8 leaves, leaves once divided into 2 to 4 ter- 

 minate, which gradually taper to a sharp point. The fruiting 

 verticils are somewhat contracted, forming a rather compact mass, but 

 not dense as in the following species (hence the name) : i, 

 Antheridia, about 300 //. in diameter ; oogonia, usually aggre- 

 gated (2 to 3), with persistent coronulae ; spores, about 275 /< 

 long by 240 /* wide, with 6 or 7 sharp ridges, which are somewhat 

 prominent. Membrane of the spore, roughened or reticulated, 

 only seen in mature oospores. 



This species has been gathered in the Saranac Lake, N. Y. T. F. 

 Allen ; Shamokin, Penn. ; New Jersey, T. F. Allen ; various local- 

 ities in Illinois, especially along the Mississippi River region, 

 Patterson, Aug., 'Si ; in Missouri at various periods in March, 

 Weller ; Sept., Blankinship, Oregon ; Sauvies 'Island, Howell ; 

 Texas, Lindheimer ; seven localities in Mexico. 



VAR. BRACHYTELES, A. Br. Characterized by greatly ab- 

 breviated terminal segments of the leaves, first described from 

 specimens found near St. Louis ; Decently sent me by Mr. C. 

 Mohr., from the delta of the Mobile River, Alabama. 



N. LINDHEIMER, A. BR., characterized by A. Braun, is very closely related 

 to N. Belangirl, A. Br. , of the East Indies (Bombay, etc.), "larger than the 

 forms of sxOoglomerata from Illinois and St. Louis." I have seen but one imper- 

 fect speciman in the Engelmann herbarium, and cannot discover any essential 

 difference from the typical subglomerata. The oospores are of the same size, and 

 the membrane marked exactly in the same way. We are obliged to wait for the 

 re-discovery of the plant to illustrate it, gathered by Lindheimer at Friedricksburg, 

 Texas. 



In the Lithograph Nos. I and 2 mag.. 25 diam. No. 3 x 50 diam. The 

 photogravure half the natural size. 



