SPORES HYALINE. 



smaller spores (compare Note 147, Letter 49). We do not know this 

 species in Europe. The flesh dries hard and contracts much in drying. 



SPECIMENS. Mostly our own collection, it being our most common, white species around 

 Cincinnati. 



POLYPORUS CALKINSII. Pileus usually applanate, some- 

 times ungulate, varying from one to four centimeters thick. Surface 

 smooth (or slightly rough), but with no distinct crust; ochraceous in 

 dried specimens. Flesh white, soft when growing, but drying hard 

 and rigid. Pores very minute, the tissue isabelline, the mouths adustus, 

 drying very hard and rigid. Spores globose, hyaline, 3>^-4 mic. 



Calkins sent this plant abundantly to Ellis from Florida twenty 

 years ago. Ellis named it Polyporus Calkinsii, but did not publish it. 

 It was published by Murrill, also, as Polyporus Palmarum, Polyporus 

 nivosellus, and Trametes lignea. The latter two are thicker and of 

 different shape, but we believe all have the same essential characters, 

 and appear to us to be the same plant. It is quite a common species 

 in the American tropics and often on palms, but occurs also in the 

 East. We have specimens from Malay, which we referred at first to 

 Polyporus ostreif ormis ; but the type of ostreiformis is not the same 

 to us. 



Compare ligneus, nivosellus, Palmarum. 



POLYPORUS OSTREIFORMIS. Pileus sessile, applanate, 

 about 7-10 mm. thick. Surface rough, dull, greyish, or with adustus 

 spots. Flesh hard, rigid, tough, greyish white. Pores minute, greyish. 

 Spores globose, 4-4^ mic. 



This is a species of the East, quite similar to Polyporus Calkinsii 

 of American tropics, but with different surface. The name has little 

 application. It has not much more resemblance to an oyster than it 

 has to a shingle. 



SPECIMENS. Java, Dr. J. van Breda de Haan (compared with type at Kew), Dr. van Leeu- 

 wen; also two doubtful collections from Japan. 



Compare griseus. 



POLYPORUS SUBMURINUS. Pileus white, slightly cinereous, 

 drying darker (murinus). Surface anoderm, no distinct crust, rough, 

 uneven. Flesh white, drying hard, with a faint cinereous tinge. Pores 

 small, round, drying hard and firm. Spores 3^ x 8, hyaline, straight, 

 smooth, cylindrical. 



This is a plant of the American tropics. We have collections 

 which we made in Florida, and which are all we have. It is quite close 

 to Polyporus Spraguei, in fact, liable to be confused with it, but was 

 put in a different genus by its author. It is also quite close to Fomes 

 abruptus of the East. 



307 



