K K K> I!-\V ATKH AI 1 Till- I N I T K 1 STAT! - 49 



its fellow. This routing \vas not at ;ill uniform, lint was covered with inaminillatod 

 MM, and consequently \aried from two to M\ lines in thickness. Internally, it 



-triated or radiated, but not so evidently as the following species, and presented 

 st \< ral distinct variegated /.ones. It was quite soft to tlic touch, as well as readily 

 broken or crushed, and under the microscope was seen to contain very little lime 

 salt. When dried it has a pronounced sebaceous appearance. The filaments com- 

 posing it are remarkable for tlieir great length, often apparently running from the 

 bottom to the top of the frond. They arc rarely if ever branched, and appear 

 ne\er to be furni>hed with any heterocysts save at tlieir enlarged base. I have 

 never seen any distinct hairs terminating them, their ends always appearing broken 

 and open. They are often quite tle.xuous or even tortuous. The internal filament 



markablc for having its articles so distinctly separated. It is often very much 

 interrupted, and in specimens pn. -em d in carbolic-acid water is of an orange-brown 

 color. 



1- 'ig. :J, pi. 4, represents a single filament magnified 260 diameters. 



'A. P.I r< i /oiiata. \\ ", (sp. nov.) 



Z iiiirri>-virilis, enormiter semiovalis, ad 6" longa, dura, lubrica, non fragilis, calcc prcgnana, 

 iiitus a basi distinctc radiata, parce et stepc obsolete zonata; trichomatibus mod ice longis, 

 subn-ctis; trichomatibus intcrnis cylindricis inarticulatis vcl articulatis, et interdum niouili- 

 fi>nuil)us ; articulis longis et cylindricis vel brevibua et globosis ; vaginis amplis, fibrillosis; 

 cfllulis pcrdurantibus basalibus ct iaterjectis, his oblongis Tel cylindricis, illis globosis et 

 tuepe gcmiiiis. 



.i. Cell. perd. basal. ,," .00017"; trichom. cum vag. , B \, " , B : \, "=.00025" 00037". 

 Sine vag. .00006" .00008". 



Hob. In saxis irroratis. " Cave of the Winds," Niagara. 

 Far. Z. cinerca. 



Blackish green, irregularly semioval, to 6 lines long, hard, slippery, not fragile, impregnated with 

 lime, internally distinctly radiate, sparsely and often obsoletcly zoned; filaments moderately 

 long, straightish ; internal filament cylindrical, not articulated or articulated, sometimes monili- 

 form ; joints long and cylindrical, or short and subglobose ; sheath ample, fibrillose ; hcterocysts 

 basal and interposed in the body of the filament ; tbe former globose, often geminate ; the 

 latter oblong or cylindrical. 



Var. Cineritious in color. 



Remarks. I found this plant growing on rocks as glossy, blackish, very hard and 

 slippery fronds or masses, which varied in size from that of very small shot to 

 nearly half an inch in length. The larger ones were not nearly so high as long, 

 and presented irregular, almost bossellated upper surfaces. The filaments are 

 often very evidently and frequently pseudoramose. The external surface of the 

 broad sheath is covered with numerous fibrilla?, which envelop and seem sometimes 

 to wrap it round and round. The color of the frond internally, when broken, is 

 mostly a dark chocolate, and the surface presents a radiated appearance, with but 

 two or three zones at most, and, in the very dark specimens, even these are not 

 evident. No signs of spores have been found. Certain specimens which I ob- 

 tained growing with the others, instead of being blackish in color, are grayish, but 



7 April, 1878. 



