Vrit Brecher Wittrock. 



Measurements. Fertile specimens. Cauloid part. The vegetative cells 

 of the principal filament are on an average 105 fi thick. Specimens of the'^ first 

 type of ramification have in general thicker cells; those of the second narrower. 

 The greatest observed thickness (in the former) is 130 fi, the least (in the latter) 

 85 ft. The branches of the l:st degree are on an av. 74 fi thick. They vary 

 between 45 /i and 105 ft. The branches of the 2:d degree are on an av. 53 /1 

 thick. They vary between 45 and 60 The length of the vegetative cells is less 

 in specimens of the first type of ramification than in those of the second. In the 

 former they are in general 4—6 times as long as thick, but in the latter 6—8 times. 

 The shortest vegetative cells are scarcely any longer than the thickness; but the 

 longest as much as 20 times as long as thick. - The inclosed cylindrical spores 

 are on an av. 63 fi thick and 88 fx long. The limits of variation are indicated by 

 i h ' to r>5 iio The iwt'loseel cask-shaped spores are on an av. 104 fx thick and 

 157 V long. The limits of variation are indicated by f- j|g ^ fx. The inclosed 

 spores of irregular shape are on an av. 121 /i thick and 133 fx long. They vary 

 between 1* and j** The lower of the twin spores arc rather thick but very 

 short, on an av. 117 /* thick and 103 fi long. The terminal subcorneal spores have 

 on an av. the same thickness as the inclosed, viz. 63 ft, but are considerably longer, 

 measuring: on an av. 155 u. The limits of variation are indicated by t , h - ;*f Jl 5 , 90 n. 



o ' *> 1. 245, 165 ' 



The cask-shaped terminal spores, narrowing towards their top, are on an av. 95 n 

 thick and 148 ;i long. The limits of variation are indicated by f; 12 9 5°, no 



Rhizoid part. In the only rhizoi'd I have seen, the vegetative cell was 90 ft 

 thick; the inclosed spore 90 fi thick and 95 // long, and the terminal spore 90 fi 

 thick and 175 ft long. 



The single sterile specimen that I have seen had the principal filament 

 125 fx, the branches of the l:st degree 75 fi and the branches of the 2:d degree 

 70 fi thick. 



Affinities and Differences, There is no need to compare this species to any 

 but its nearest relatives, P. Zelleri (v. Mart.) nob. and P. Roetthri (Roth) nob. 

 It is most clearly distinguished by its very numerous inclosed cylindrical spores 

 and by the subcorneal terminal ones. Besides, it differs from the two species men- 

 tioned by smaller dimensions and less powerful ramification. 



7. Pithophora Zelleri (v. Mart.) nob. 



Synon. (Vaclophora Zelleri v. Mart. Die Tange, p. 111. pi. 2. fig. 1 (the 

 figure not good). 



Diagnosis: Principal filament of the cauloid part of the thallns in 

 fertile specimens on an av. 120 ft thick, with branches usually of two 

 degrees, solitary or opposite in pairs; spores partly inclosed, partly 

 terminal; the spores of the principal filament regularly in pairs, the 

 spores of the branches commonly solitary; the upper one in a pair 

 of twin spores (and the solitary now and then occurring in the principal 



