REPORT OF THE STATE BOTANIST I917 H3 



(plate 21, figure 6). Of this thickness the major part is composed 

 ot the tube lengths. The subiculum is rather thin and in mature 

 specimens often nearly extinct. The tubes vary from one-half of 

 a millimeter to 6 mm in length, the latter measurements sometimes 

 attained where the tubes are in an oblique position. In well-formed 

 specimens their lengths run from 2 to 4 mm in eastern collections. 

 The mouths of the tubes are rounded or slightly angular, averaging 

 3 to a millimeter. The walls of the dissepiments are rather thin 

 but entire. Most often there is no sheen or silkiness to the 

 hymenium but in some few specimens cons : derable luster is 

 developed. 



The spores are ellipsoidal sometimes markedly oblong-ellip- 

 soidal or ovoid, some with an oblique apiculus (plate 20, figure 7), 

 hyaline, 4.5 to 6 ^ long, and 2.5 to 3.5 ^ broad. The cvstidia vary 

 considerably and the structures so referred may not be true cystidia 

 at all. Sometimes they are scarcely more prominent than basidia 

 and such are to be distinguished only by their pointed apex. At 

 other times they are quite conspicuous, two or three times thicker 

 than the basidia and with a rounded, swollen apex, or swollen 

 toward the top but the apex itself blunt pointed. These structures 

 are represented in the illustration, plate 20, figures 3, 4. Their 

 size varies from 15 to 20 ^ long and 5 to 7 ^ in diameter at the 

 thickest part in the larger forms. They appear to occur constantly 

 in the type specimens and in most other collections examined. The 

 hyphae of the trama are compactly arranged and their diameter 

 varies from 2 to 5 ^ They are simple or only rarely branched 

 and as far as revealed by the ordinary powers of the microscope 

 no cross walls are present and no clamp connections. The hyphae 

 of the subiculum are often considerably larger (4 to 7 /*) but in 

 other respects they do not differ from those of the trama (plate 

 20, figures 5 and 6). Many of the hyphae from both regions have 

 quite thick walls similar to those in the hyphae of P. i n d u r a t a . 

 Irregular crystals are usually abundant on and in the hvmenium. 



The affinities of the species are with such as Po'ria pul- 

 chella, Poria medullapanis and Poria ornata 

 From the last mentioned it appears to differ constantly in the much 

 greater diameter of the hyphae, which in those two species (as 

 interpreted by the writer) are only r to 3 A* in diameter and con- 

 siderably branched. The hyphae of P. pulchella appear to 

 be intermediate in diameter between those of these species. There 

 are differences of appearance, however, hard to describe, which have 

 so far enabled the writer to separate these two species. 



