301—MICRO-PHOTOGRAPHS. 
The micro-photographs that we present in our plates are not 
good. Ordinary photography is simply mechanical and requires neither 
much skill nor experience, but in making high power micro-photographs 
of opaque objects difficulties are met that we have not as yet been able 
to overcome. We present them because they show shape and size ex¬ 
actly but they are little more than silhouettes and are of value only in 
contrast. 
For example. Compare our micro-photograph of the spores of 
Secotium macrosporum (Plate 13, fig. 16) with that of Secotium 
acuminatum (Plate 13, fig. 11) and a contrast will be seen, that words 
cannot convey. 
Besides they can be measured accurately as each millimeter repre¬ 
sents a micron and there is little room for error. But the surface mark¬ 
ings are an absolute failure. 
We have taken this matter up with an authority who “ wrote a 
book” on the subject. He kindly tried to help us out but his prints 
were not as good as our own. We also placed the subject in the hands 
of a firm in London that makes a business of micro-photography. They 
returned the material and acknowledged that they could not give us 
what we wanted. If any of our readers can make a micro-photograph 
of an opaque object, with a high power lens, an even magnification of 
a thousand, and show not only shape and size but surface we hope they 
will come to our aid. 
302—MITREMYOF.S RAVENELII IN JAPAN. 
We have received from T. Yoshinago, Kochi, Japan, two collec¬ 
tions of Mitremyces Ravenelii, exactly the same plant we have in the 
United States (see Myc. Notes, p. 126, plate 9). Both collections 
were made at Mt. Ushioe, Tosa, one by M. Gono, the other by 
K. Nakanishiki. 
A record of this species in Japan was made in ‘‘Nature” within 
a year or two and the same plant from Japan has 
also been recently described as new species.* 
I found in the Museum at Berlin specimens that 
were collected at Nagasaki by Schottmiller in 1860 
but they were undetermined until recently. 
On comparing our cut herewith of the Japanese 
plant (Fig. 80) with the figure on plate 9 of the 
American plant it will appear that the plant is 
smaller and has less development of the root fibers. 
Our figure on plate 9 was made from an unusually fine, large specimen, 
the figure herewith gives a better idea of the plant as it usually reaches 
me from my American correspondents. The type specimens at Kew 
are also about this size. 
* Calostoma japonica (Eng. Jahr. 190‘2). 
Fig. 80. 
201 
