48 Journal of the Mitchell Society \_Jwie 



Spores (of No. 1850) maize-yellow, subspberical, papillate and 

 reticulated, one oil drop, 6.3-7.5 x 7.5-8.2/*. 



Our Chapel Hill plant is exactly like L. g7nseus from Miss Burling- 

 liam, except for the vinaceous tint and larger size. The spores, also, 

 are identical and differ from those of L. helvus. The color has re- 

 mained constant for five years and may be said to characterize our 

 form. The typical form is said to be slate-gray to smoke-gray, be- 

 coming yellowish with age, and its maximum size is less. At matu- 

 rity the cap of the Chapel Hill form is azonate as described, but when 

 young it may be distinctly zoned. Plants collected from the same 

 spot (apparently the same mycelium) may be quite mild at one time 

 and distinctly acrid at another; all of one collection are either mild 

 or acrid. The plants, which are single or cespitose, are frequently 

 attacked by a white mold which may completely cover them and ruin 

 the larger part of a colony. 



1850. Low, damp, deeply-shaded spot at base of Lone Pine Hill, September 20, 



1915. Photo. 

 2305. Same place as No. 1850, June 29, 1916. 



2350. By Meeting of the Waters Branch, near Scott's Hole, July 3, 1916. 

 2560. Low damp place at foot of Lone Pine Hill, June 24, 1917. Photo. Taste 



distinctly acrid and slightly bitter; growing in same place as plants 



of collection No. 1850, which were mild. Spores as in No. 1850, 



6.6-7.5 X 7.5-8.5^. 

 3114. Same spot as collection No. 1850 and identical in all respects. 



39. Lactarius plinthogalus (Otto) Burl. 

 L. fuliginosus Fr. 



Plates 30 and 40. 



Cap up to 5.2 cm, broad, dull, dry, surface with texture of leather 

 and with a bloom when young, no zones, flatly depressed in center, 

 the margin strongly incurved in youth, rather light buffy-drab to 

 much lighter straw-buff or white, tending to be somewhat rugose and 

 pitted in center or all over. Plesh rather thin, nearly white, but 

 usually turning quickly salmon or brick red when cut, sometimes 

 scarcely changing. Milk white, unchanging or sometimes becoming 



