BOTANICAL GAZETTE. 228 



servations may justify their union. The spores in the present species 

 are a little broader and more distinctly warted or roughened than in 

 the preceeding one. 



PucciNiA PLUMBARiA. — Spots brown and indefinite, sometimes 

 none ; sori mostly hypophyllous, sometimes amphigenoos, orbicular 

 oblong or irregular, scattered or crowded, sometimes confluent, prom- 

 inent, at first covered by the epidermis and then of a ])eculiar lead- 

 color, blackish when exposed; spores obova'c or elliptical, obtuse, 

 slightly constricted at the septum, minutely rough. .001 2-. 001 6 of an 

 inch long, .0008-. 001 of an inch broad, the pedicel very short, color- 

 less. 



Living leaves and stems of Co/lomur f^racilis and Phlox longifolia. 

 June and August Utah. Joins. 



The form on Phlox has the sori more scattered and on both sides 

 of the leaf, otherwise I find no satisfactory mark of distinction, and 

 believing the two to be forms of one species I have united them. 

 The dark sori, while covered by the thin epidermis, have a peculiar 

 leaden tint which suggests tho specific name. 



PucciNiA Calochorti.— Spots blackish or none; hyineiiifcrous 

 fungus with the peridia crowded, short, clustered, the s])ores subglo 

 bose or angular, yellow or orange, about .0008 of an inch broad ; 

 teleutosporous fungiis with sori scattered or crowded, oval or oblong, 

 black, the spores subelliptical, obtuse, slightlv constricted at the sep- 

 tum, rough, .00 1 4-. 00 1 6 of an inch long, about .001 of an inch 

 broad, the pedicel short. 



Living leaves of Calochortus NuttalUi. Utah. June. Jones 

 The species is related to P . Lojkiana, but our fungus has the 

 spores smaller, more obtuse and not so coarsely warted. Both the 

 yEcidium and the Pucania occur on the same leaf. 



Isoetes lacustl'is. —The following note is so interesting that we 

 reproduce it from 7V(//«r(^' (April 7 ) and would ask our collectors to 

 make note of any similar behavior ow the part of this species in our 

 own country : 



In a paper read before ihe Academy of Sciences of Paris (Jan. 

 10, 1881.) M. E. Mer calls attenticjn to the peculiar conditions under 

 which different forms of this fresh-water plant seem to originate 

 in the L.ike or Longeiner. The basin of this lake was once occupied 

 by a glacier, and now presents several different sorts of lujttom. The 

 soil to a depth of two to three metres is comjjosed in |)art of a gravel 

 formed of rock debris united by an iron cement, in part of an( iont 

 moraines, or where near the surface these will be mixed with the re- 

 mains of |)lants and form a pretty tenacious mud In all these situa- 

 tions Isoetes is to be found, but the plants differ most remarkably 

 both as to their form, their structure, and their mode of reproduction 

 as they are found in the different habitats. Taking ihe leaf development 

 as a guide, four varieties are easily discerned :— (i) humilis, growing 

 sparsely in the gravel and sterile shallows, the leaves are not only few 

 in number, but always of diminutive dimensions; sporange generally 

 wanting or represented by a small cellular mass which rarely ever 



