112 



-P 



Valsa tuberculosa.— Perithecia 8 to lo, globose, .015' in di- 

 ameter, buried in a stroma formed of the substance of the bark, 

 which is not discolored, though rendered more compact, and sur- 

 rounded by a black circumscribing line, which penetrates deeply into 

 the wood; ascigerous . nucleus whitish; ostiola short, cylindrical, 

 stout, obtuse, with an irregular opening, united in a little fascicle, 

 which barely pierces the epidermis ; asci broadly lanceolate, .003 x 

 .0006'; paraphyses filiform ; sporidia biseriate, elliptical, with two 

 large nuclei at first, and with the endochrome finally 2-parted, about 

 .ooo5'x.ooo3'. 



Sometimes two fascicles of ostiola are erumpent from the same 

 stroma. 



On dead branches oi Amelanchier Canadensis. April. 

 Valsa vekusta. — Perithecia 15 to 20, .01' in diameter, closely 

 packed in a loose cortical stroma, which is circumscribed by 

 a black line penetrating the wood ; ostiola cylindrical, rough, 

 slender, slightly swollen above, in length 2-3 times the diam- 

 eter of the perithecia, at first united in a black, uneven, elongated 

 disk, bursting out through longitudinal fissures in the bark, but 

 which is finally obliterated by the compactly clustered, subobtuse os- 

 tiola ; asci clavate-cylindrical, ,002' — .oo25'x.ooo2' — .00025'; Para- 

 physes linear, nucleate ; sporidia 8, cylindrical, hyaline, strongly 

 curved, 3-4-nucleate, with the endochrome at length 3 — 4-times di- 

 vided, .ooo35'-.ooo45'x. 00075'. 



On dead branches of Robinia Pseudacacia. (N. A. F., No. 875.) 

 Valsa Ampelopsidts. — Perithecia few, seated on the surface of 

 the wood, without any distinct stroma ; ostiola cylindrical, subacute, 

 their tips united in an elliptical plane disk, which bursts out through 

 longitudinal fissures in the bark, but is at length obliterated ; asci 

 clavate-cylindrical ; sporidia biseriate, elliptical, subacute, hyaline 

 with a large nucleus in the centre or with 2-3 smaller ones, .0007'x 



/ 

 i 



lems of Ampelopsis quifiquefoHa, (N. A. F., No. 88x.) 



.00025— ,0003 



* 



The Migration of Weeds— of those which may be called " domes- 

 ticated plants," following man in his movements — and their occupancy 

 of ground to the exclusion of other plants less hardy and able to 

 stand in the struggle for life, is an interesting feature in geographical 

 distribution. Our nupierous railroads, traversing now the entire 

 continent, and ramifying in every direction over the States, with 

 their through-freight and through-passenger transportation, have be- 

 come the chief agents in this distribution. This struggle for Iffe on 

 the new ground opened to the combatants is more intense than by 

 the natural process, where the movements are governed by causes 

 slower in operation, and extending over a longer period. Here the 

 combatants, the champions which have won their belt on the fields 

 (to borrow a phrase from the prize-ring), are transported more 



*Oa page 74, line 27, of the Bulletin the word "leaves'* should be inserted 

 after the word " fallen," 



The habitat of Peziza Hahtesii (Vol. viii., page 66) should be changed to read 

 " rich soil among decaying leaves in dry woods." — J. B. E. 



