144 
Mycologia 
* 
Second, there is an annulus present in this species. This fea- 
ture has been noticed with interest since specimen No. 91 was 
determined (5). Students in a course in Fungi at the University 
of Washington have invariably traced it to the genus Stropharia. 
It is true that a part of the veil is characteristically appendiculate 
but the greater part forms a pendulous annulus, which is thick, 
membranaceous, and pure-white, but for the purplish-brown edges 
of the striate lamellae on the upper surface. The annulus is 
cone-shaped, has a fimbriate margin, and is fixed. 
Since it is evident from these two standpoints that this plant 
has been taxonomically misplaced, the new combination Stropha- 
ria ambigua {Peck) is proposed. 
The lamellated upper surface of the annulus brings S. ambigua 
into close relationship with the little S', bilamellata Peck (7). 
However, S', ambigua is much larger and leaves a portion of the 
veil appendiculate. 
The writer is under obligations to Dr. J. W. Hotson for help- 
ful suggestions in this work. 
Summary 
1. The species in question does not develop like Hypholoma, 
but like the annulate forms. 
2. In its young stages it has an annulus which is sometimes 
evanescent. 
3. Therefore the new combination, Stropharia ambigua (Peck), 
is proposed. 
University of Washington, 
Seattle, Washington. 
Literature Cited 
1. Allen, Caroline L. The Development of Some Species of Hypholoma. 
Ann. Myc. 4: 387-394. 1906. 
2. Atkinson, Geo. F. The Development of Agaricus campestris. Bot. Gaz. 
42 : 241-264. 1906. 
3. Beer, Rudolf. Notes on the Development of the Carpophore of Some 
Agaricaceae. Ann. Bot. 25: 683-689. 1911. 
4. Fischer, C. C. E. On the Development of the Fructification of Armillaria 
mucida (Schrad.). Ann. Bot. 23: 303-507. 1909. 
5. Murill, W. A. Agaricaceae of the Pacific Coast. Mycologia 4 : 304-305. 
1912. 
