90 NEW YORK STATE MUSEUM 



NEW YORK SPECIES OF LACCARIA 



Laccaria B. & Br. 



Pileus convex becoming umbilicate or depressed, flesh thin; 

 lamellae broadly adnate, sometimes with a decurrent tooth, becom- 

 ing mealy with the copious subglobose minutely warted white spores ; 

 stem central, externally fibrous, veil not evident. 



The species of this genus have generally been included in Clito- 

 cybe, but they are so peculiar in their general appearance that it 

 seems best to separate them. The lamellae are rather thick and 

 subdistant broadly adnate and when mature are powdered or 

 whitish pruinose from the abundant spores. These are typically 

 globose or nearly so and rough. We have included one species in 

 this genus that has oblong even spores ; but in all other respects it is 

 so closely allied to the genus that it seems best to consider the spore 

 character a specific rather than a generic one. 



KEY TO THE SPECIES 



Base of the stem radicating, clavately thickened trullisata 



Base of the stem not radicating, rarely thickened i 



I Mature pileus usually more than 4 cm broad ochropurpurea 



I Mature pileus usually less than 4 cm broad 2 



2 Lamellae violaceous amethystina 



2 Lamellae flesh colored or nearly white 3 



3 Pileus regular, becoming unpolished or minutely squamulose laccata 



3 Pileus regular, persistently glabrous striatula 



3 Pileus irregular, usually less than 12 mm broad tortilis 



Laccaria trullisata (Ellis) Pk. 



PLASTERED LACCARIA 



Sylloge V, p. 195 



Pileus fleshy, convex or plane becoming depressed in the center, 

 innately fibrous, squamose or squamulose, smoother in the center, 

 thin on the margin, reddish flesh color ; lamellae unequal, sub- 

 distant, thick, adnate or with a decurrent tooth, at first purplish 

 violet, then brick red and pruinose or white pulverulent ; stem 

 stuffed, fibrillose, colored like the pileus, the enlarged more or less 

 deeply radicating and clavately thickened base covered by a mass of 

 mycelium and adhering sand ; spores oblong or cylindric, even, 

 granular within, 15-20x8-9 fi. 



Pileus 2.5-5 cm broad ; stem 2.5-7 cm long, 5-8 mm thick. 



