376 Wisconsin Academy of Sciences, Arts, and Letters. 
is considered by Berkeley a form of L. tigrinus; but that species is 
said in the descriptions to have an irregular pileus. A small, thin 
form, of this nature appears to be L. ravenelii B. & C., described 
from specimens collected in South Carolina. 
This is by far the most common form of L. tigrinus in this coun¬ 
try, and it is usually parasitized, showing the characters appearing 
in the photographs in Plate XIX. Morgan based his Lentodium 
squamulosum on this form (Jour. Cincinnati Soc. Nat. Hist. 1895 
PI. I, fig. 3). Morgan appears never to have seen the form with 
normal gills. Dr. Moffatt found the normal and parasitized forms 
about equally common in one locality near Chicago. He says in a 
letter to me: 
(< Lentinus tigrinus was abundant a few years ago in a small wet 
swale in the woods at Glen Ellyn, Illinois, 23 miles west of Chi¬ 
cago. The timber had been cut from this swale and the plants 
grew on the decaying oak stumps. The normal form and the 
Lentodium were about equally common. One stump might have 
dozens of sporophores showing normal gills, while another a couple 
of yards away would have only the distorted ones. Several sea¬ 
sons I looked for transitional forms but never found any, nor did 
I ever find both forms on the same stump. When I came upon a 
colony of these plants I would try to determine from an inspection 
of the top and sides of the cap and stems whether or not gills 
would be present, but never was able to do so. Both forms were 
identical in size and in appearance.” 
All of Moffatt’s plants were like those illustrated in Plate XIX. 
3. Plate XX. Larger plants with irregular pilei and long, flexu- 
ous stems. The pileus and stem were coated with coarsely tufted 
umber-brown scales. The gills were very narrow and close. They 
grew on the sides of stumps at Geneseo and were very different in 
appearance from the plants illustrated in Plate XVIII, yet the 
whole character, including the spores, shows that they were a form 
of the same species. The parasitized condition of this form is 
common and is shown in Plate XXI, A. The parasitized forms 
were often shapeless masses glued together in clumps. The plants 
bore some resemblance to Cooke’s figure (Illust. 1139 A.) 
4. Plate XXI, BD. More robust plants with very thick stems, 
the pileus thick and not splitting on the margin, covered with 
blackish scales. These plants resemble those illustrated by Britzel- 
mayr (Lentinus 10). They were usually parasitized. The plant 
