172 SECTION HYGROCYBE 



17. Stipe 3-10 mm thick 19 



18. Spores 5-7(8.5) X 3.5-5 ^ 103. H. parvulus 



18. Spores 5-7 X 2.5-3.5 /x 104. H. mijcenoides 



19. Odor distinctive (use fresh specimens) 20 



19. Odor not distinctive 21 



20. Odor mephitic; gills grayish violaceous 105. H. mephiticus 



20. Odor nitrous; gills whitish at first (see H. ovinus also) 



106. H. nitiosus 



21. Lamellae drab gray 107. H. cinerascens 



21. Lamellae not as above 22 



22. Pileus honey yellow becoming lime green 108. H. virescens 



22. Not as above 23 



23. Pileus gray-brown to brownish-fuliginous; lamellae whitish at first .... 

 110. H. ovinus 



23. Pileus otherwise colored 24 



24. Pileus pale ocher yellow when young; lamellae pale yellow 



109. H. tahquamenonensis 



24. Pileus some shade of orange or yellow; lamellae reddish orange or 

 yellow 60. H. marginatus var. marginatus 



90 



Hygrophorus aurantius (Murr. ) Murr. 



Mycologia 4: 332, 1912 



Hydrocybe aurantia Murr., Mycologia 3: 195. 1911. 



Pileus 1.5 cm broad, obconic, aurantiacous, dry or moist, glabrous, 

 margin smooth or slightly striate. 



Lamellae adnate, subconcolorous, rather broad and distant. 



Stipe 2.5 cm long, about 2 mm thick, aurantiacous, apex pruinose, 

 elsewhere glabrous, slightly tapering downward. 



Spores 4-5 X 3-5 fx, subglobose, ovoid, or short-ellipsoid, smooth, 

 non-amyloid. Basidia 26-38 X 4-6 /x, 4-spored. Pleurocystidia and chei- 

 locystidia none. Gill trama parallel to subparallel. Cuticle of repent 

 hyphae, a cutis. No hypodermium. Pileus trama of radial hyphae. 

 Clamp connections present on the gill trama hyphae; none found in 

 the cuticular hyphae. 



Habit, Habitat, and Distbibution — On the ground in woods, Ja- 

 maica, December-January. 



Matebial Studied — Jamaica: Murrill 743 (type, from Morce's 

 Gap, 5000 feet elevation, Dec. 29, 30, Jan. 2,1908-09). 



Obsebvations — The microscopic characters given above are 

 based on our study of the type. This species is related to H. deceptivus, 

 but the pileus of the latter is brownish to buff. 



Although the names Agaricus aurantius Sowerby and Agaricus 

 aurantius Vahl. (Fl. Dan.) both are considered to be applied to Hy- 

 grophori, we have been unable to locate an actual combination of that 



