224 SECTION HYGROCYBE 



SERIES PSITTACINI 



Key to Species 



1. Pileus white to whitish 2 



1. Pileus colored 3 



2. Lamellae adnexed; stipe 5—10 mm thick 131. H. tvestii 



2. Lamellae decurrent; stipe 2-3 mm thick . . 135. H. laetus f. pallidas 



3. Pileus green to blue at first, fading to yellow or vinaceous 4 



3. Not as above 5 



4. Pileus green, fading to yellow . . 132. H. psittacinus var. psittacinus 



4. Pileus blue, then red, finally yellow 



133. H. psittacinus var. californicus 



5. Pileus often multicolored — olive, yellow, and reddish intermingled or 

 a blend of these, becoming pinkish-vinaceous in age or when dried; 



often with an odor of fish 134. H. laetus 



5. Not fading as in above 6 



6. Pileus yellow when young 7 



6. Pileus red when young 15 



7. Pileus convex-depressed young; bright yellow fading to whitish; la- 

 mellae typically long-decurrent 136. H. nitidus 



7. Not as above 8 



8. Lamellae adnexed to emarginate or at times becoming free 9 



8. Lamellae broadly adnate to decurrent 10 



9. Pileus at maturity deep lemon yellow 137. H. chlorophanus 



9. Pileus at maturity scarlet to orange 144. H. luteistipes 



10. Cheilocystidia present, cylindric to filamentose 11 



10. Cheilocystidia absent 12 



11. Pileus, lamellae, and stipe yellow and remaining so dried 



138. H. hondurensis 



11. Fruit body pinkish-vinaceous when faded or dried 134. H. laetus 



12. Stipe white; clamp connections none on hyphae of fruiting body . . 



139. H. flavifolius 



12. Stipe colored 13 



13. Stipe orange-red at first 140. H. suhminutulus 



13. Stipe yellow from the beginning 14 



14. Spores fusoid 141. H. citrinopallidus 



14. Spores ellipsoid to ovoid 142. H. ceraceus 



15. Taste of pellicle bitter 143. H. real 



15. Taste mild 16 



16. Spores 5-7 ^ long; lamellae broad; stipe red, slowly fading 



140. H. suhminutulus 



16. Spores 7-10 p. long 17 



17. Lamellae whitish; stipe yellow; gills nearly free . . . .144. H. luteistipes 



17. Not as above 18 



18. Epicutis of pileus an ixotrichodermium 128. H. perplexus 



18. Epicutis of pileus of appressed gelatinous hyphae 



145. H. minutulus 



