10 ERYTHEA. 



but is to 'oe corupured with P. Middendorfii (Riipr.) Kjellm. ; No. 

 203, Co'istantinea Sitcheiisi?!, i? C. rosamariiiii (GJme].)P. & R.; No. 

 218, Gigartiiia exasperata is simply a luxuriant young form of 

 G. radula (Esp.) J. Ag.; No. 219, Gigartina radula, is plainly 

 G. paj)illata (Ag.) J. Ag.; No. 222, Gigartina rnicropl)ylla, is a 

 young Grateloupia; No. 239 is certainly not Luminaria digitata as 

 understood by European and Eastern algologists, since it possesses 

 mucilage ducts in the stipe, but is to be compared with forms of 

 L. Bongardiana P. & R.; No. 241. It generally requires either 

 considerable experience with Alarias in the field, or the lack of 

 it, to give the ordinary algolngist the courage necessary to pro- 

 pose to add a new species to this already well-stocked and variable 

 genus. Yet in Aiarin cordata Tilden, we find such a creation, 

 so little characterized either by the specimens distributed or by the 

 description published that its sole claim to specific distinctness 

 seems to rest upon the shape of the base of the sporophylls. But 

 we are not told, directly or indirectly, how we may distinguish A. 

 cordata from either A. Pylaii Grev. or A. grandifolia J. Ag., in 

 both of which the same character occurs; No. 242. Adenocystis 

 Lessonii is clearly not this brown alga of the Antarctic Ocean, 

 but the well-known red alga Halosaccion Hydrophora (P. & R.) 

 J. Ag. ; and No. 281, Codium toraentosum, is C. mucronatum, var. 

 Californicum J. Ag. These are a few of the most conspicuous 

 of the liberties taken with the names of our Pacific Coast species 

 and are sufiicient to demonstrate that greater care should be taken 

 in determining the plants promised for Century IV than has been 

 used in coi\nection with the century before us. — w. A. s. 



SHORT ARTICLES. 



A New Weed on Western Ranges. — In July of this year 

 Mr. H. H. Chapman, of Ashland, Oregon, sent to the U. S. Depart- 

 ment of Agriculture a plant which was becoming a troublesome 

 weed in that locality. He stated that it was first observed there 

 about four years ago, and now it has taken possession of about 100 

 acres of the range. Stock do not eat it, and therefore it grows 



