488 TRANS. OF THE ACAD. OP SCIENCE. 



tached to the living plant, but destitute of vitality. The 

 buds are very short and ascending in the cespitose species, 

 J. acuminatum etc.; in the creeping ones they form shorter or 

 longer stolons, fibrous (J. falcatus, J. phceocephalus) or fleshy 

 {JT. scirp>oides), and often bearing a bunch of leaves at their 

 end; in J. nodosus the stolons form thin fibres, which bear lit- 

 tle bulbs, and often a series of them, the source of the stems 

 of next season (see Herb. norm. 74, where in many specimens 

 the old withered stolons with the vestiges of the decayed 

 stems of last season and the new ones can be seen). The 

 species of the first section (Junci genuini) have stout hori- 

 zontal rhizomas, and none stouter than the maritime species 

 (./". acutus and Rcemerianus), which bear upright stems at 

 almost every node, and not at the end like most articidati ; 

 where the internodes are short, they become cespitose, where 

 they are long the plants are called creeping; difference in 

 soil and moisture, however, seem considerably to influence 

 the length of the internodes in the same species. 



Pag. 427. For "J. ])allesce}is" wherever that name is used 

 for one of our species, read J. acuminatus ; for "var. frater- 

 nus" var. legitimiis ; for "*/! 13uckleyi" J. leptocaidis / and 

 for "«/. saginoides" J. triformis, var. uniflorus. 



Pag. 428. The "subgenus JunceUus 1 '' here and p, 436 must 

 be cancelled. 



In J. pelocarpus and J. acuminatus the viviparous buds are 

 the result of retrograde metamorphosis ; in other cases they 

 may be produced by insects, and are then much larger de- 

 generations. 



Pag. 430. It is evident, that the sculpture of the seeds is 

 the result of the structure of both the epidermis and the next 

 inferior layer of cells, which both together probably consti- 

 tute the testa ; in some species it is more one, in others more 

 the other stratum, which gives character to the appearance of 

 the seed. My investigation of these points is not sufficiently 

 advanced to furnish definite results ; but I may state, that, 

 what I have, in common with other authors, designated as the 

 testa, properly seems to be the epidermis only, consisting of 

 a single layer of cells, always larger than those of the layer 

 under it, and never transverse. In most species the epider- 

 mis is thin, transparent, and closely adhering to the body of 

 the seed; in others {,1. Rwmerianus, -Balticus, arcticus, etc.) 

 it is thicker, swells up when moistened and may then be de- 

 tached; in others again, those with tailed seeds, it is quite 

 thick and loosely adhering to the body of the seeds, so as al- 

 most entirely to obscure their proper sculpture. In the first 

 two classes the cells of the epidermis are about as wide as 

 they are long, and only in part correspond with the sculpture 

 of the seed; they seem, however, to cause the markings des- 

 ignated by me as "levissime irregulariter reticulata" (p. 432, 



