58 



Mycologia 



Septobasidium pinicola sp. nov. 



Fructification resupinate, effused, coriaceous, in general circular 

 in shape, more or less concentrically sulcate, separable from sub- 

 stratum, roughly tomentose to strigose, army brown to natal- 

 brown when dry, the margin light-drab to cinnamon-drab, strigose ; 

 in structure lacunar, spongy, 1-1.8 mm. thick, individual hyphae 

 under the microscope clay-color to tawny-olive, thick-walled, even, 

 3-3.5 fi in diameter, loosely interwoven so as to form a spongy 

 structure with locules, branching to form a lighter colored hy- 

 menium about 80-1 10 fx thick; probasidia terminal or lateral, hya- 

 line, pyriform to subglobose, 10-15 x 15-17 throughout hyme- 

 nium ; spore-bearing organs straight, hyaline, 54-66 x 6-7 /x, 3-sep- 

 tate, growing from probasidia and projecting above hymenium; 

 spores hyaline, simple, curved, 14-17.5 x 3-3.5 borne singly from 

 each of 3 cells of probasidium, acropetally as far as observed. 



Fructification 3-60 mm. but more commonly 10-35 mnl - m diam- 

 eter, 1-1.8 mm. thick. 



Type in herbarium of Walter H. Snell, No. 550; co-types in 

 herbaria of Missouri Botanical Garden, No. S7°93> anc ^ Forest 

 Pathology, No. 36832. 



On bark of living Pinus strobus in New England and New York 

 and probably co-extensive with the habitat of this host; also on 

 Pinus monticola in Idaho. Found sporulating after prolonged 

 moist and rainy period in August. 



Collections known : 

 On Pinus strobus. 

 Maine : 



1 Standish : in F. P. No. 20639, coll. by W. H. Chadbourne ; same 



in Mo. Bot. Gard. comm. by Dr. Perley Spaulding. 

 Kennebunkport : in Mo. Bot. Gard. No. 5091 and in Farlow Herb., 



coll. by Mrs. A. M. Pier, March and April. 

 1 Mount Vernon: in Mo. Bot. Gard., coll. by Dr. W. J. Morse, 



comm. by Dr. Perley Spaulding, March. 

 Kittery Point: in Farlow Herb., coll. by R. T. Baxter, spring. 

 Brunswick : in Herb. WHS No. 499, June. 

 New Hampshire : 



North Conway: in Herb. WHS No. 559 and No. 601 ; F. P. No. 



36832, Aug. and Sept.; several coll. in Mo. Bot. Gard., comm. 



by the writer and one by Dr. A. S. Rhoads, Sept. 

 Welch's Island, Lake Winnipesaukee : WHS No. 502, June. 

 Vermont : 



Townshend : in Mo. Bot. Gard. No. 55603 and in Farlow Herb., 

 coll. by W. G. Hastings, comm. by Dr. Perley Spaulding. 



1 Specimens not examined by the writer. 



