04 " ' Vkit Brkcifkr AVtttrock. 



Measurements. Fertilo specimens. Cnuloïd piirt. Tlic vegetative cells 

 of the priiici));)! filament are on an average 105 f.i 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 /a, the least (in the latter) 

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

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

 thick. They vary between 45 and (10 fi. The length of the vegetative cells is less 

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

 former they are in general 4— fJ times as long as thick, bnt in the latter G— 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. (53 ,u thick and 88 ;i long. The limits of variation are indicated by 

 ']'■ « c'5 lio ''• ''"''^ inclosed cask-shaped spores are on an av. 104 ,« thick and 

 157 Vt long. The limits of variation arc indicated by 'j^^- j|^ ^^1'^ l*^ /.i. The inclosed 

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

 between \'^- l^ and }^ ,(i. The lower of the twin spores are rather thick but very 

 short, on an av. 117 /i thick and 103 ,« long. The terminal subconical spores have 

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

 measuring on an av. 155 ii. The limits of variation are indicated by ',''• ^f^ .^ jj!» /(. 

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

 thick and 148 /.i long. The limits of variation are indicated by 'i*;- ,5" m, no ^^■ 



Rhizoïd part. In the only rhizoi'd I have seen, the vegetative cell was 90 /i 

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

 thick and 175 ß long. 



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

 125 ,((, the branches of the l:st degree 75 ,11 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. Zellcri (v. Mart.) nob. and P. RodtJcri (Roth) nob. 

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

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

 tioned by smaller dimensions and less powerful ramification. 



7. Pithopliora Zelleri (v. Mart.) no).. 



Synon. (JIadophora ZcUcri v. Mart. Die Tange, p. 111. pi. 2. fig. 1 (the 

 figure not good). 



Diagnosis: Principal filament of the canloïd part of the thalhis in 

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

 degrees, solitar}^ 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 upj^er one in a pair 

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



