152 



assumes a direct migration inland, the plant becoming gradually 

 accustomed to a decreasing salt-content of the water, and aquatic 

 animals, birds, etc., being the agents by which dissemination up 

 stream beyond the reach of the tide is accomplished. 



Caloglossa Leprieurii has been made the subject of an able 

 and detailed morphological monograph by the late Professor 

 Cramer, of Zurich, based upon material from New York and 

 Ceylon. It may be remarked incidentally that this plant is a 

 most elegant object, from the pedagogical standpoint, for the 

 demonstration and study of the development of a thallus from an 

 apical cell. 



A KEY TO THE NORTH AMERICAN SPECIES 

 OF LACTARIUS — II** 



By F. S. Earle 



Subsection Piperati 

 i. Milk white, changing to cream-color or yellow. 2. 



Milk white, unchanging. 3. 



2. Pileus yellowish-white, tomentose ; stipe solid, velvety. Z. subvellereus Pk. 

 Pileus yellowish flesh-color, spotted ; stipe hollow, glabrous. 



Z. chrysorrheus Fr. 



3. Pileus white or whitish or tinted. 6. 

 Pileus reddish-brown, 1-2.5 cm - '■> stipe white. L. parvus Pk. 

 Pileus grayish-brown, with shades of lilac. 4. 

 Pileus dark brown, fuliginous or umbrinous. 5. 

 Pileus dark green, very acrid. Z. atro-viridis Pk. 



4. Lamellae distant, yellowish, not staining. L. pyrogalus (Bull.) Fr. 

 Lamellae crowded, flesh-color, staining greenish. Z. varius Pk. 



5. Pileus convex-umbilicate, rivulose-floccose ; stipe 2.5 cm. 



Z. unibrinus { Pers. ) Fr. 

 Pileus infundibuliform, dry, not polished ; stipe 3-8 cm. 



L. plumbius (Bull.) Fr 



6. Pileus villous or tomentose, at least on the margin. 7 

 Pileus glabrous. 10 



7. Lamellae crowded. 8 

 Lamellae distant. 9 



8. Pileus white, then orange, silky-villous. Z. villosus Clem 

 Pileus white to pale ochracous, glabrate, margin silky. Z. involutes Soppitt 



9. Pileus white, persistently tomentose ; spores nearly smooth. Z. vellereus Fr. 

 Pileus white, often spotted, becoming glabrate ; spores rough. Z. deceptivus Pk. 



* Continued from page 141. 



