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Remarks (internal):S. paradoxa s.str. 
Description type:Non-original description 
Description:Schizopora paradoxa (Schrad.: Fr.) Donk s. str. Fig. 1 A, 2 D, E, F, J, K.
Selected lectotype: Irpex paradoxus ? Schrad./Sweden, Femsjö/ Ex herb. E. Fries (UPS). A minor part of the collection belongs to Hyphodontia quercina (Fr.) John Erikss.
Syn.: Hydnum obliquum Schrad.: Fr. Selected lectotype: Irpex obliquus Fr./Sweden, Sbdermanland, Tvetaberg/ 1860-01/ Coll. C.P. Laestadius. Ex herb. E. Fries (UPS). Poria laciniata Vel.!
Fruitbody resupinate, whitish - creamcoloured, irregularly hydnoid - denticulate - labyrinthiform, denticles thin - rather thick, often provided with small projections. Hyphal system dimitic; skeletals very thick-walled with a narrow lumen, not branched, acyanophilous, generally abundant; generative hyphae with clamps, more or less thickwalled. The presence o€ skeletals is most easily observed in byssoid margins of the fruitbody or in the trama; capitate cystidia rare, incrustation of hyphae in the pore mouth variable, often absent; spores ellipsoid, 5-5.35.5 x 3.3-3.6-4 µm, when measured from spore prints.
DISCUSSION. Usually there are no problems in distinguishing the two species just by a look at the hymenophore (25x) - at least for C. and N. European specimens. However, there are also specimens which are difficult to interpret, especially among perennial ones or when the fruitbody has grown on a vertical substrate. In these cases the microstructure is distinctive.
The true skeletals with very thick walls and narrow lumina are usually frequent in S. paradoxa, the capitate hyphal endings are much fewer and the spores are somewhat larger than in S. radula. Generative hyphae of the latter species are thick-walled and could be mistaken for skeletals. However, the cell lumen in those hyphae is wide and the septa are clamped.
Just as in the closely related genus Hyphodontia, there is a gradual transition from moderately thick-walled, generative hyphae into more thick-walled hyphal endings (cystidia or "skeletocystidia").
Judging from material used in the compatibility tests there are no noticeable differences in the colour of the fruitbodies. S. paradoxa seems to be more frequent in the E. parts of Central Sweden. There are many collections on Corylus from Uppland and on Betula from Dalarna. On the W. coast it is almost absent, while S. radula is very common here. In many places both species occur. Within a small area on E. Jutland (Denmark) both species were collected several times. S. paradoxa was found there on wood in a dry heath locality while S. radula only was collected in various kinds of humid, deciduous forests.
Most collections (in herb. GB) from C. Europe belong to S. radula as well as all from N. Iran.
In B.C.,Canada, all collections seen from the Vancouver area belong to S. radula while one from the interior (Wells Gray Nat. Park) belong to S. paradoxa.

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