504 EDWARD A. BURT ON A 



Anthurus borealis, sp. nov. Plates 49 and 50. 



Solitary or subcaespitose. Stipe white, clavate, divided above into 6 erect, narrowly lanceolate, hollow arms 

 incurved above, and with pale flesh-colored backs which are traversed their entire length by a shallow furrow having its 

 surface continuous with the surface of the stipe; cavity of the stipe nearly closed at the base of the arms by a thi 11 

 diaphragm opening above into a closed chamber with dome-shaped wall even on its inner surface and adherent to the 

 arms for about J their length; gleba brownish olive-green, supported upon the dome and closely embraced by the arms; 

 spores simple, olive-green, ellipsoidal, \ X 14 |i, 5-8 on septate and constricted basidia. 



Total height of plant 10-12 cm. ; arms about £ of this ; greatest diameter of stipe 15 mm. 



Hob. Near East Galway, New York (Burt), on a cultivated sandy hillside. 



Although in its general aspect this fungus bears a certain external resemblance to 

 Anthurus australiensis (Cooke and Massee) Ed. Fischer, as the latter is illustrated by 

 Fischer in "Neue untersuch. phalloideen," Fig. 57, yet it differs from that species in the 

 erect position ; in structure of its arms ; in having a dome-shaped chamber separated 

 from the cavity of the stipe by a diaphragm ; and in its slightly narrower spores. 



From the Brazilian species, A. sanctae-catharinae Ed. Fischer, it differs in about 

 the same characters and also in its white stipe. 



It seems to approach more closely to another South American form, A. clarazianus 

 (Miiller) Ed. Fischer.' It differs from this in being about four or five times as 

 large ; in not having the wall of the arms sharply differentiated in structure from that of 

 the stipe ; in having its stipe with a circular outline in cross section, while the form 

 described by Spegazzini is noted by Fischer to have been indistinctly hexagonal ; 2 and 

 in its smaller spores. Seven arms are sometimes also present in that species. 3 



But it seems to be very distinct from the other species of Anthurus in its approach 

 toward Lysurus. It is the only species of Anthurus at present known in the northern 

 continents. 



In conclusion, I desire to express my heartiest thanks to Prof. W. G. Farlow for the 

 use of books from his library and for his direction in this research ; and to Prof. R. 

 Thaxter for his critical examination of certain preparations. 



EXPLANATION OF THE PLATES. 

 Figures 4-23 were drawn with the aid of an Abbe camera lucida. 



LETTERS COMMON TO ALL THE FIGURES. 



M, medullary tissue of axis of plant in young stages— occupies the space of the main central cavity of mature plant. 

 M', gelatinous layer of peridium — of medullary origin, 

 i, inner wall of peridium. 

 C, cortical layer, or outer wall of peridium. 



C, cortical plates — portions of cortical layer not pushed outward by the extrusion of the medullary masses in the for- 

 mation of M'. 



1 Fischer: Neue untersuch. phalloideen, p. 28, taf. 2 Fischer : Untersuch. phalloideen, p. 65. 



C, fig. 40. 3 J. Miiller in Flora, 1873, p. 526, and tab. 6, B. 



