Clavarias of the United States and Canada 197 



the dark, cartilaginous-looking tips (as in Nos. 4620, 4626, 4631), 

 or the entire plant may become reddish cartilaginous (as in Nos. 

 2789, 5270, 5304). 



Spores (of No. 4514) white, smooth, subelliptic to amygdali- 

 form, 6-6.8 x 15-18(j., the mucro end curved. Basidia 4-spored (a 

 few 2-spored in other collections and in No. 2789 nearly all were 

 2-spored), 11-14^ thick, with long sterigmata. Cells of the flesh 

 long, filamentous, very little branched, about 3[x thick, no clamp 

 connections. 



This is, we think, the true L. semivestitum as shown by the 

 co-type in the Curtis Herbarium from Pennsylvania (Michener, 

 No. 1184; Curtis, No. 4260). The collection consists of two 

 plants, one 4 cm. high ; the branches slender, upright ; apices red- 

 dish cartilaginous, remainder grayish brown; one plant branched 

 into two parts a little above the ground, the other with more stalk; 

 surface without tomentum at any place, appearing, with the ex- 

 ception of the reddish tips, as if dusted superficially with a most 

 minute grayish or yellowish pulverulence. We could find no spores 

 on these plants, but microscopic examination of the co-type at Kew 

 shows it to be in full agreement with ours. Forms of this species 

 (as No. 4631) look in passing much like slender forms of Tre- 

 mellodendron, but are easily distinguished by the absence of vis- 

 cidity. Burt has seen our No. 2789 and referred it to this species. 

 We have received from Juel (Upsala) as Thelephora contorta a 

 collection that seems to be the present species. The spores are 

 long-elliptic with oblique mucro, 6-7.4 x \7-22\t.. 



It is not easy to believe that all our numbers referred here are 

 the same species. No. 2789 and No. 4514 may be considered ex- 

 tremes of size and of appearance in the dried state. The former 

 when dry is dull drab and opaque except for the tips, the latter is 

 dark cartilaginous throughout except for clay colored stripes. 

 Microscopic characters fail, however, to show any differences 

 that can be associated with those above mentioned, and we are 

 therefore treating them all as the same. 



Lachnocladium cartilagineum B. & C. (Journ. Linn. Soc. 10: 

 330. [1869] 1868) is closely related to the present species, but is 

 easily separated by the spores. From the type at Kew we find 

 them to be subspherical to oval, drop-shaped, smooth, hyaline, 



