53 



This must be admitted though I saw Heer's types of lanceolata 

 at Zurich and they are strikingly similar to our Laramie plant 

 from Marshall, Colo. Knowlton states that the name 7iavi- 

 cularis should be applied to the American species but unfortu- 

 nately it was founded exclusively on Heer's plant, his name 

 being a homonym. The Laramie plant (type from Marshall) 

 described as navicularis by Knowlton may stand as F. Knowltoni 

 n. n. 



The cryptogamic plants are represented by quite a series of 

 ferns, some of them striking forms, a single imperfectly known 

 Equisetum , and an algal form which Lesquereux called Deles- 

 seria fulva. This last cannot be referred to any particular 

 genus and should be consigned to Seward 's blanket genus 

 Algites or better rejected as indeterminate. Standing as a 

 Delesseria it will be taken as evidence of marine conditions. 



Conifers are poorly represented, doubtless owing to the 

 conditions in the locality. The fragments of Sequoia etc., as the 

 author suggests, may have been washed from higher ground. 

 We must not forget that there was doubtless an upland flora, 

 very distinct from that of the swampy region, of which we 

 cannot expect to recover more than small fragments. 



T. D. A. COCKERELL. 



VON TUBEUF: MONOGRAPHIE DER MISTEL* 



It is not often that the reviewer has before him a monograph 

 as complete in every detail as this one on the mistletoe by the 

 author of the well-known Pflanzenkrankheiten durch krypto- 

 gam Parasiten verursacht, published in 1895. The monograph 

 is the result of many years of study and experimentation on 

 the part of Dr. von Tubeuf of the L^'niversity of Munich, who 

 has been ably assisted by Dr. Gustav Neckel, professor in the 

 University of Berlin and Professor Dr. Heinrich Marzell. The 

 book in large octavo is printed attractively on glazed paper, 

 which allows of the reproduction of the photographs and maps 

 in the body of the text. 



*Tubeuf, Karl Freiherr von: Monographic der Mistel. Mit 5 beigehefteten 

 lithographierten Karten und mit 35 Tafeln sowie 181 Figuren im Text. Seiten 

 xii+832. Miinchen und Berlin, 1923. Druck und Verlag von R. Oldenberg, 

 Miinchen, Gliickstrasse 8. 



