DARK-SPORED AGARICS— IV 



DECONICA, ATYLOSPORA, AND PSATHYRELLA 



In previous articles of this series, the large, fleshy-stemmed 

 species have been discussed. The present article deals with species 

 having a slender, tubular stipe with cartilaginous cortex, and not 

 furnished with an annulus. The three genera here treated may be 

 distinguished as follows : 



Lamellae decurrent. Deconica, 

 Lamellae adnate or adnexed. 



Spores purplish-brown or dark-fuscous. Atylospora. 



Spores black. • Psathyrella. 



Deconica (W. G. Sm.) Sacc. Syll. Fung. 5: 1058. 1887 

 Delitescor Earle, Bull. N. Y. Bot. Gard. 5 : 434. 1909. 



This is a very small genus, separated from Psilocybe as a sub- 

 genus by W. G. Smith in 1870, because of its decurrent lamellae, 

 and raised to generic rank by Saccardo in 1887. The attachment 

 of the lamellae often varies to adnate or to adnate with a decurrent 

 tooth. Two species, D. bullae ea and D. scatigena, were discussed 

 in my article on tropical agarics published in Mycologia for Jan- 

 uary, 1918. 



Stipe 5-8 cm. long. i. D. coprophila. 



Stipe 1 -s cm. long. 



Pileus floccose or tomentose, not striate. 



William A. Murrill 



Pileus floccose near and on the margin. 

 Pileus tomentose over the entire surface. 

 Pileus glabrous, usually striate. 



Pileus dry or hygrophanous, not viscid. 



2. D.rhomboidospora. 



3. D. tomentosa. 



Stipe 1-2.5 cm. long. 



Pileus not umbonate. 

 Pileus umbonate. 



4. D. bulbosa. 



5. D. semistriata. 



Stipe 2.5-5 cm. long. 



Pileus not decidedly umbonate. 

 Pileus decidedly umbonate. 



6. D. polytrichophila* 



7. D. pyrispora. 



Pileus viscid. 



Spores 12 X 9 /W. 



Spores 7 X 5 



8. D. subviscida. 



9. D. bullacea. 



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