Maria J. Cano:

Taxonomic revision of Hennediella Paris (Pottiaceae, Bryophyta)

2008. 142 pages, 68 figures, 2 tables, 14x23cm, 310 g
Language: English

(Bryophytorum Bibliotheca, Band 64)

ISBN 978-3-443-62036-3, paperback, price: 54.00 €

in stock and ready to ship

Order form

BibTeX file


morphologicalplant sizeHennedielamorphologischPflanzengröße


Abstract top ↑

The moss genus Hennediella is taxonomically revised. A key, descriptions, illustrations, distribution data, LM and SEM photographs of the 15 species recognized are provided. A morphometric study of 226 specimens is carried out to test the most significant characters and a multivariate analysis is made for the Hennediella heimii group to distinguish patterns of morphological differentiation. Thirty-seven names are lectotypified and two epitypes designated. Hennediella serrulata and H. angustifolia are transferred to the genus Syntrichia. Desmatodon spelaeus, Hennediella oedipodioides, Pottia chubutensis and Syntrichia astoma are synonymyzed with H. heimii, and Pottia fusco-mucronata and Hennediella acutidentata with H. antarctica. Hennediella acletoi and T. leiostomoides are synonymyzed respectively with H. denticulata and H. longirostris. The sporophyte of Hennediella bellii is described for the first time. New records for various countries of the study area are reported.

Review: Nova Hedwigia 87/3-4 (November 2008) top ↑

Hennediella is a somewhat puzzling genus which had been previously included in various genera, such as Desmatodon, Pottia, Syntrichia, and Tortula. It was re-defined by Zander (1993) who distinguished 20 species, with a distributional center mainly in the southern hemisphere. Due to uncertain boundaries concerning characters, the recognised taxa, however, often integrade somewhat and the deliminations given still are unsatisfying. Especially the deliminations against Tortula and Syntrichia still remain difficult, and without a world-wide revision of especially Tortula, problematical. Main characters used at present are KOH colour leaf reactions [orange to red in Hennediella and Syntrichia versus yellow (rarely orange) in Tortula] and anatomy of the costa [stereids semicircular in Hennediella, lunulate in Syntrichia and (semicircular) circular in Tortula]. Aim of the present revision therefore is to provide a comprehensive taxonomic synthesis of the species currently placed within the genus Hennediella.

The revision is based on extensive field studies and new collections from South America, as well as the analysis of more than 1100 specimens from 49 institutional and three private herbaria all over the world. 226 of them were used as ‘operational taxonomic units’ (species groups) for a morphometrical analysis, where 54 quantitative characters were measured to test the most significant characters. Unfortunately, the data matrix used is not given and only available upon request by the author. To save printing costs, this is meanwhile very common, but the basic data of the study thus are lacking. This holds true for the full list of studied specimens, which, however, is available on the web (

As a result, 17 taxa (15 species, two varieties: H. antarctica, H. arenae var. arenae, H. arenae var. petriei, H. bellii, H. densifolia, H. denticulata, H. heimii, H. heteroloma var. eckeliae, H. heteroloma var. heteroloma, H. kunzeana, H. longipedunculata, H. longirostris, H. macrophylla, H. marginata, H. polyseta, H. stanfordensis, H. steereana) were presented, based on morphological similarities. 37 names are lectotypified, and two epitypes designated. Hennediella acletoi is synonymysed with H. denticulata, and Tortula leiostomoides with H. longirostris. The former H. angustifolia and H. serrulata are transferred to the genus Syntrichia, and Desmatodon spelaeus, H. oedipodioides, Pottia chubutensis, and Syntrichia astoma are synonymyzed with H. heimii, H. acutidenta and P. fusco-mucronata with H. antarctica.

After a short historical review of the taxonomy and nomenclature of ‘Hennediella’, the study continues with the deliminations of the genus, ‘material & methods’, the taxonomic characters used, the results of the morphometric analysis [14 box plots, two scatterplots (PCA, DA) of the H. heimii-antarctica group] and some short remarks on the habitat and distribution (including a diagramm of the altitude variation in the genus). 14 of the 15 species recognized occur in the southern hemisphere. Chapter ‘Taxonomy’ comprises the main part of the book, starting with a key to 15 species. The following 89 pages provide a detailed description of all taxa, including synonymy, distributional remarks, and illustrations (line drawings, LM and SEM photos of leaf surface, cross-section of the leaf and costa, peristome, and spores). The species descriptions are very detailled and instructive and the line drawings and photos given are superbly and of high quality. They show the main diagnostic characters. A list of selected specimens examined, a hint to additional illustrations, as well as a well stated discussion completes each description. The study ends with doubtful, excluded and invalid names and a list of references.

The revision is a well-done, well based and solid study. The taxonomic treatment, even if geographically mainly restricted to the southern hemisphere is very useful for identyfing species and a further step towards lightening and understanding one of the most prominent and difficult families (Pottiaceae) in bryology.


Nova Hedwigia 87/3-4 (November 2008)

Revision: Gorteria 34 (2009-2010) top ↑

Deze revisie betreft een klassieke taxonomische studie op grond van morfologische kenmerken en is de eerste wereldomvattende revisie van Hennediella, een bladmossengeslacht met zijn grootste diversiteit op het zuidelijk halfrond. María Cano heeft voor haar onderzoek vooral in Zuid-Amerika veldwerk verricht en aanvullend materiaal van Hennediella verzameld. Na zorgvuldige bestudering van de variabiliteit heeft zij het aantal soorten tot 15 gereduceerd.

De familie Pottiaceae, waartoe Hennediella behoort, is een familie waarin de verwantschappen en soortomgrenzingen nog onvoldoende bekend zijn. Aanvullend moleculair onderzoek zou ook voor Hennediella tot een completer inzicht kunnen leiden.

In Nederland komt, voor zover bekend, slechts één Hennediella-soort voor, H. heimii (Zilt kleimos), een soort die floristen die terreinen bezoeken die wel eens overspoeld worden met zout of brak water vast wel eens gezien hebben. In Europa komen ook nog twee andere Hennediella- soorten voor: H. stanfordensis (Groot-Brittannië, Frankrijk, Ierland, Griekenland) en H. macrophylla (Groot-Brittannië). Beide soorten zijn nog niet in ons land gevonden. Het aantal bekende vindplaatsen van H. stanfordensis in Groot-Brittannië is door gericht zoeken op geschikte standplaatsen echter flink toegenomen.

Cano’s revisie ziet er goed verzorgd uit, zoals we van de serie Bryophytorum Bibliotheca gewend zijn. Het werk bevat een sleutel tot de 15 soorten, uitgebreide beschrijvingen, uitstekende lijntekeningen van alle beschreven soorten en prachtige SEM-foto’s van microscopische details. Van elke soort is een verspreidingskaart opgenomen.

Joop Kortselius

Gorteria 34 (2009-2010), page 119

Table of Contents top ↑

Abstract 5
Acknowledgements 6
Introduction 7
Delimitation of the genus Hennediella 7
Material and methods 10
Taxonomic characters 11
Habit, plant size and stems 11
Axillary hairs 11
Rhizoids and rhizoidal gemmae 12
Leaf: Orientation, shape, size and stratification 14
Leaf: Apex, margins and costa 14
Leaf: Areolation 16
Sexuality 18
Seta 18
Capsule 21
Operculum 21
Calyptra 21
Spores 21
Morphometric analysis 25
Habitat and distribution 33
Taxonomy 36
Hennediella 36
Key to the species of Hennediella 37
Hennediella bellii 39
Hennediella heteroloma 43
Hennediella longipedunculata 49
Hennediella denticulata 54
Hennediella arenae 60
Hennediella marginata 68
Hennediella densifolia 72
Hennediella longirostris 77
Hennediella polyseta 83
Hennediella steereana 89
Hennediella kunzeana 90
Hennediella stanfordensis 96
Hennediella macrophylla 101
Hennediella antarctica 107
Hennediella heimii 113
Doubtful and excluded names 129
Invalid names 132
References 133
Index to scientific names 139